[llvm-commits] [commit-after-approval] c94 define __STDC_VERSION__

[Ryan Flynn]

match gcc behavior by defining preprocessor token
__STDC__VERSION=199409L if given -std=iso9899:199409

before:
$ echo "" | gcc -dM -E -std=iso9899:199409 - | grep STDC
#define __STDC_HOSTED__ 1
#define __STDC_VERSION__ 199409L

$ echo "" | clang-cc -dM -E -std=iso9899:199409 | grep STDC
#define __STDC_HOSTED__ 1
#define __STDC__ 1

after:

$ echo "" | ~/proj/llvm-commit/Debug/bin/clang-cc -dM -E
-std=iso9899:199409 | grep STDC
#define __STDC_HOSTED__ 1
#define __STDC_VERSION__ 199409L
#define __STDC__ 1
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