X86: Use 'mov' instead of 'lea' in Win64 SEH prologues when possible
'mov' and 'lea' are equivalent when the displacement applied with 'lea' is zero. However, 'mov' should encode smaller. llvm-svn: 230269
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'mov' and 'lea' are equivalent when the displacement applied with 'lea' is zero. However, 'mov' should encode smaller. llvm-svn: 230269