Revert "clang/test/Driver/crash-report.c: This requires rewriter for -frewrite-includes. [PR20321]"

We've decided to make the core rewriter class and PP rewriters mandatory.
They're only a few hundred lines of code in total and not worth supporting as a
distinct build configuration, especially since doing so disables key compiler
features.

This reverts commit r213150.

Revert "clang/test: Introduce the feature "rewriter" for --enable-clang-rewriter."

This reverts commit r213148.

Revert "Move clang/test/Frontend/rewrite-*.c to clang/test/Frontend/Rewriter/"

This reverts commit r213146.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@213159 91177308-0d34-0410-b5e6-96231b3b80d8

test/CXX/basic/basic.start/basic.start.main/p2.cpp

@@ -10,7 +10,6 @@
 // RUN: cp %s %t
 // RUN: %clang_cc1 -x c++ %s -std=c++11 -fsyntax-only -verify -DTEST9
 // RUN: not %clang_cc1 -x c++ %t -std=c++11 -fixit -DTEST9
-// REQUIRES: rewriter
 // RUN: %clang_cc1 -x c++ %t -std=c++11 -fsyntax-only -DTEST9
 
 // RUN: %clang_cc1 -fsyntax-only -verify %s -DTEST10

test/CXX/temp/temp.spec/cxx1y-variable-template-no-body.cpp

@@ -2,7 +2,6 @@
 // RUN: cp %s %t
 // RUN: not %clang_cc1 --std=c++1y -x c++ -fixit %t -DFIXING
 // RUN: %clang_cc1 --std=c++1y -x c++ %t -DFIXING
-// REQUIRES: rewriter
 
 template<typename T> 
 T pi = T(3.1415926535897932385); // expected-note {{template is declared here}}

test/CXX/temp/temp.spec/no-body.cpp

@@ -2,7 +2,6 @@
 // RUN: cp %s %t
 // RUN: not %clang_cc1 -x c++ -fixit %t -DFIXING
 // RUN: %clang_cc1 -x c++ %t -DFIXING
-// REQUIRES: rewriter
 
 template<typename T> void f(T) { }
 template<typename T> void g(T) { }

test/Coverage/html-print.c

 // RUN: %clang_cc1 -emit-html -o %t %s
 
-// -emit-html requires rewriter.
-// REQUIRES: rewriter
-
 #include "c-language-features.inc"

test/Driver/crash-report.c

@@ -10,9 +10,6 @@
 // RUN: cat %t/crash-report-*.sh | FileCheck --check-prefix=CHECKSH %s
 // REQUIRES: crash-recovery
 
-// PR20321: diag invokes clang -E with -frewrite-includes.
-// REQUIRES: rewriter
-
 // because of the glob (*.c, *.sh)
 // REQUIRES: shell
 

test/Format/lit.local.cfg

-if config.root.clang_rewriter == 0:
-    config.unsupported = True

test/Frontend/Rewriter/lit.local.cfg

-if config.root.clang_rewriter == 0:
-    config.unsupported = True