[X86 fast-isel] Constrain the index reg class to not include SP.
The index reg on instructions with complex address modes is a GPR64_NOSP. Constrain it to appease the machine verifier. llvm-svn: 236557
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The index reg on instructions with complex address modes is a GPR64_NOSP. Constrain it to appease the machine verifier. llvm-svn: 236557