[X86] Basic additions to support RegCall Calling Convention.
The Register Calling Convention (RegCall) was introduced by Intel to optimize parameter transfer on function call.
This calling convention ensures that as many values as possible are passed or returned in registers.
This commit presents the basic additions to LLVM CodeGen in order to support RegCall in X86.
Differential Revision: http://reviews.llvm.org/D25022
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@284108
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