Add support for '__is_literal_type' spelling of the existing
'__is_literal' type trait for GCC compatibility. At least one relased
version if libstdc++ uses this name for the trait despite it not being
documented anywhere.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@130078 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed