[PATCH] Make CallingConv::ID an alias of "unsigned".

[Alexey Samsonov]

Hi nicholas,

Make CallingConv::ID a plain unsigned instead of enum with a
fixed set of valus. LLVM IR allows arbitraty calling conventions (you are
free to write cc12345), and loading them as enum is an undefined
behavior. This was reported by UBSan.

http://reviews.llvm.org/D5248

Files:
  include/llvm/IR/CallingConv.h
  lib/AsmParser/LLParser.cpp
  lib/AsmParser/LLParser.h
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