Pull clang-cc code for generating PTH files based on the input type.
 - <rdar://problem/6741594> [pth] don't abuse -x to drive pth
   generation

 - Simpler, and fixes PR3915.

Cleanup test cases for PTH:
 - Update to use -emit-pth

 - Removed PTH test of carbon.c and cocoa.mm; these didn't actually
   verify anything, and since PTH is token based the extra coverage
   (over cocoa.m) isn't particularly helpful.

 - Split PTH tests in cocoa.m to cocoa-pth.m, solely to increase
   available parallelism when running tests.

Ted, could you update the PTH test cases (include-pth.c and
cocoa-pth.m) to have some sort of positive check that the PTH is
getting used? "# of PTH cache hits" or "tokens read from PTH cache"
statistics would work great. :)


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@68189 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Sema/carbon.c b/test/Sema/carbon.c
index edb4d97..983a000 100644
--- a/test/Sema/carbon.c
+++ b/test/Sema/carbon.c
@@ -1,5 +1,4 @@
-// RUN: clang-cc %s -fsyntax-only -print-stats &&
-// RUN: clang-cc -x c-header -o %t %s && clang-cc -token-cache %t %s
+// RUN: clang-cc %s -fsyntax-only -print-stats
 #ifdef __APPLE__
 #include <Carbon/Carbon.h>
 #endif