[PATCH] Intrin: Add _umul128

[David Majnemer]

Hi rnk, hansw, thakis,

Implement _umul128; it provides the high and low halves of a 128-bit
multiply.  We can simply use our __int128 arithmetic to implement this,
we generate great code for it:
        movq    %rdx, %rax
        mulq    %rcx
        movq    %rdx, (%r8)
        retq

http://reviews.llvm.org/D6486

Files:
  lib/Headers/Intrin.h
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