Use getVRegDef() instead of def_iterator. This leads to fewer defs being added
with 2-address instructions, for about a 3.5% speedup of StrongPHIElimination on 403.gcc. llvm-svn: 122635
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with 2-address instructions, for about a 3.5% speedup of StrongPHIElimination on 403.gcc. llvm-svn: 122635