Rename test/Sema/expr-comma-c89.c to expr-comma-c99.c. Spotted by

Anton Lokhmotov.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@126482 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Sema/expr-comma-c89.c b/test/Sema/expr-comma-c99.c
similarity index 100%
rename from test/Sema/expr-comma-c89.c
rename to test/Sema/expr-comma-c99.c