[PATCH] [FastIsel][X86] Fix invalid register replacement for bool args

[Keno Fischer]

Address review comments

http://reviews.llvm.org/D6245

Files:
  lib/Target/X86/X86FastISel.cpp
  test/CodeGen/X86/fast-isel-call-bool.ll
  test/CodeGen/X86/fast-isel-x86-64.ll
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