[AsmPrinter, CodeView] There are some more ways of getting wchar_t
[AsmPrinter, CodeView] There are some more ways of getting wchar_t

C++ has a builtin type called wchar_t.  Clang also provides a type
called __wchar_t in C mode.

In C mode, wchar_t can be a typedef to unsigned short.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@271793 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/llvm,apple/swift-llvm,llvm-mirror/llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,apple/swift-llvm,apple/swift-llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,apple/swift-llvm