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Fixes rdar://11353109 & http://llvm.org/bugs/show_bug.cgi?id=12689

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We need to identify the value of ptr as
ElementRegion (result of pointer arithmetic) in the following code.
However, before this commit '(2-x)' evaluated to Unknown value, and as
the result, 'p + (2-x)' evaluated to Unknown value as well.

int *p = malloc(sizeof(int));
ptr = p + (2-x);

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The resulting type info is stored in the SymSymExpr, so no reason not to
support construction of expression with different subexpression types.

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(Currently, this is only relevant for tainted data.)

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The change resulted in multiple issues on the buildbot, so it's not
ready for prime time. Only enable history tracking for tainted
data(which is experimental) for now.

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x86_64-arguments.cpp test file and be sure to test the coerced
case as well.  Thanks to Wei-Ren Chen for bringing this test
to my attention.

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#define TEST int y; int x = y;
void foo() {
  TEST
}

-Wuninitialized gives this warning:
invalid-loc.cc:4:3: warning: variable 'y' is uninitialized when used here
      [-Wuninitialized]
  TEST
  ^~~~
invalid-loc.cc:2:29: note: expanded from macro 'TEST'
#define TEST int y; int x = y;
                            ^
note: initialize the variable 'y' to silence this warning
1 warning generated.

The second note lacks filename, line number, and code snippet.  This change
will remove the fixit and only point to variable declaration.

invalid-loc.cc:4:3: warning: variable 'y' is uninitialized when used here
      [-Wuninitialized]
  TEST
  ^~~~
invalid-loc.cc:2:29: note: expanded from macro 'TEST'
#define TEST int y; int x = y;
                            ^
invalid-loc.cc:4:3: note: variable 'y' is declared here
  TEST
  ^
invalid-loc.cc:2:14: note: expanded from macro 'TEST'
#define TEST int y; int x = y;
             ^
1 warning generated.



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not as we expect; it may be due to racing issue of a file coming from PCH
changing after the PCH is loaded.

rdar://11353109

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for __NSContainer_literal.



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refactorings in that revision, and some of the subsequent bugfixes, which
seem to be relevant even without delayed exception specification parsing.


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Patches by Csaba Raduly (rcsaba@gmail.com)

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them, otherwise we cannot produce an error for both

struct HIDDEN test4; // canonical
struct test4;
struct DEFAULT test4;

and

struct test5; // canonical
struct HIDDEN test5;
struct DEFAULT test5;

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related to laying out ivar structs and accessing non-fragile-ivar
in more compilated cases. // rdar://11323187


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TableGen-generated StringMatcher, for a 1.2% speedup in -fparse-only
time in <rdar://problem/11004361>. Thanks to Benjamin for pointing me
at StringMatcher!


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we accept are not modeled somehow via Attr.td.


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as an AST node, and fold a number of such attributes into Attr.td.


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Without the '<' prefix in the doxycomment these comments were incorrectly
attached to the proceeding comment on the next line, rather than the
preceeding one.

Fixes PR12722

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and const (as "__const") using tblgen, rather than explicitly hacking
them in.


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Driver: Turn the default value for -fmath-errno into a proper target hook and disable it by default on more platforms.

For now -fno-math-errno is the default on BSD-derived platforms (Darwin,
DragonFlyBSD, FreeBSD, NetBSD, OpenBSD). If the default is not right for
your platform, please yell. I only verified the result with the default
compilers on Darwin and FreeBSD.

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Benjamin has suggested a better approach.


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we're looking at a normal token. Tiny positive impact -fsyntax-only
time for <rdar://problem/11004361>.


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IdentifierInfo *) with a static StringMap, improving -fsyntax-only
performance by 1% for the example in <rdar://problem/11004361>.


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-fpack-struct's handling has changed in CC1 (one of only two flags that needed changing) because the driver treats "-fpack-struct" as a boolean flag, and CC1 (did) treat it as an option with a separated value.

This change causes -fpack-struct=X to be forwarded correctly to -fpack-struct=X instead of erroneously to "-fpack-struct X"



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allowed, and it'll blow up in unfortunate ways when using a proper
C++11 library.

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the parsing of such things appears to be a conforming extension, but it breaks
libstdc++4.7's std::pair.


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Really just a wild stab in the dark.

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Refine analyzer diagnostics by adding an expression "cone-of-influence" to reverse track interesting
values through interesting expressions.  This allows us to map from interesting values in a caller
to interesting values in a caller, thus recovering some precision in diagnostics lost from IPA.

Fixes <rdar://problem/11327497>

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 * Work around build failures due to gcc 4.2 bugs.
 * Remove BodyIndexer::TraverseCXXOperatorCallExpr, which was not being called
   prior to this change, and whose presence disables a RecursiveASTVisitor
   stack space optimization after this change.


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warning.

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