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initialization of static const floating-point data membmers (John's
patch, in r113663).


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used in the default function argument as "used". Instead, when we
actually use the default argument, make another pass over the
expression to mark any used declarations as "used" at that point. This
addresses two kinds of related problems:

  1) We were marking some declarations "used" that shouldn't be,
  because we were marking them too eagerly.
  2) We were failing to mark some declarations as "used" when we
  should, if the first time it was instantiated happened to be an
  unevaluated context, we wouldn't mark them again at a later point.

I've also added a potentially-handy visitor class template
EvaluatedExprVisitor, which only visits the potentially-evaluated
subexpressions of an expression. I bet this would have been useful for
noexcept...

Fixes PR5810 and PR8127.



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preambles end up leaving the precompiled preambles around. This is by
design, since we do minimal cleanup during crash recovery. However,
it's unfortunate for testing, so introduce a hook that allows these
two tests to put the precompiled preamble somewhere where we can
delete them after testing.


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just abort creation of the precompiled preamble rather than doing
silly things. This is the second part of the fix for the weird
preamble-related failures on Windows. Big thanks to Francois Pichet
for the great detective work!


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Windows GetTempPath() function, and be sure to create the directory in
which the precompiled preamble will reside before creating the
temporary file itself.


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Patch by Dimitry Andric!

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information when imported variable is used
more than once. Originally though to be a bug in importing
block varibles. Fixes radar 8417746.



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emitting a #pragma, whenever one is needed. Fixes <rdar://problem/8417307>.



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currently expect that to be useful for plugins, and this is important for
startup performance:
--
ddunbar@lordcrumb:tmp$ touch empty.c
ddunbar@lordcrumb:tmp$ runN 100 ~/llvm.obj.64/Release/bin/clang -c empty.c
name	  avg  	  min  	  med  	  max  	   SD  	 total 
user	 0.0054	 0.0052	 0.0054	 0.0055	 0.0000	 0.5350
 sys	 0.0084	 0.0090	 0.0078	 0.0087	 0.0008	 0.8390
wall	 0.0149	 0.0149	 0.0149	 0.0149	 0.0003	 1.4943
ddunbar@lordcrumb:tmp$ runN 100 ~/llvm.obj.64/Release/bin/clang -c empty.c
name	  avg  	  min  	  med  	  max  	   SD  	 total 
user	 0.0036	 0.0036	 0.0036	 0.0038	 0.0000	 0.3646
 sys	 0.0072	 0.0071	 0.0068	 0.0070	 0.0006	 0.7158
wall	 0.0123	 0.0123	 0.0122	 0.0136	 0.0003	 1.2262
--

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of whatever we were using before...

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Make 'setProperty()', 'setBase()', and 'setLocation()' private in ObjCPropertyRefExpr, and friend ASTStmtReader so that it is the only class that can use them.

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Polish diagnostics for null dereferences via ObjC ivar accesses.  Finishes up <rdar://problem/6352035>.

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reference object to a c++ member function.
fixes radar 8409336.


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the call argument is a string literal. Fixes
<rdar://problem/8413477>.


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