[Frontend] Remove actual ImplicitExternC member variable.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@173860 91177308-0d34-0410-b5e6-96231b3b80d8
clang/test/Driver/asan-ld.c: Try not to mismatch temporary file, like "tmpkcfdld".

If we had the regular expression "\b" in FileCheck like Perl...

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@173861 91177308-0d34-0410-b5e6-96231b3b80d8