In C++, allow builtins to be referred to via qualified name lookup, e.g.,

  ::__builtin_va_copy

Fixes one of the Firefox issues in PR5511.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@95966 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed