Craig Topper 7a0c601f95 [X86] Revisit the fix I made years ago to make 'xchgl %eax, %eax' not encode using the 0x90 encoding in 64-bit mode. ...

Prior to this we had a separate instruction and register class that excluded eax to prevent matching the instruction that would encode with 0x90.

This patch changes this to just use an InstAlias to force xchgl %eax, %eax to use XCHG32rr instruction in 64-bit mode. This gets rid of the separate instruction and register class.

llvm-svn: 322532

2018-01-16 06:07:16 +00:00

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