[PCH] Mark a PCH file with a flag to indicate if the serialized AST had
compiler errors or not.

-Control whether ASTReader should reject such a PCH by a boolean flag at ASTReader's creation time.
By default, such a PCH file will be rejected with an error when trying to load it.

[libclang] Allow clang_saveTranslationUnit to create a PCH file even if compiler errors
occurred.
-Have libclang API calls accept a PCH that had compiler errors.

The general idea is that we want libclang to stay functional even if a PCH had a compiler error.
rdar://10976363.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@152192 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Index/werror.c b/test/Index/werror.c
index 150095d..98b602a 100644
--- a/test/Index/werror.c
+++ b/test/Index/werror.c
@@ -7,9 +7,6 @@
 void fatal(float);
 #endif
 
-// CHECK-FATAL: translation errors
-
 // RUN: c-index-test -write-pch %t.pch -Werror %s
-// RUN: not c-index-test -write-pch %t.pch -DFATAL -Werror %s 2>%t.err
-// RUN: FileCheck -check-prefix=CHECK-FATAL %s < %t.err
+// RUN: c-index-test -write-pch %t.pch -DFATAL -Werror %s