[PATCH] Fix an issue with certain constants as live values in patchpoints.

[Sanjoy Das]

Hi ributzka, atrick,

The patchpoint lowering logic crashes with live constants equal to the tombstone or empty keys of a DenseMap<uint64_t, T>.  This patch fixes the issue (and adds a tests case).

http://reviews.llvm.org/D6101

Files:
  include/llvm/CodeGen/StackMaps.h
  lib/CodeGen/StackMaps.cpp
  test/CodeGen/X86/stackmap-large-constants.ll
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