Craig Topper 8172ed91f8 [X86] Speculatively fix to X86AvoidStoreForwardingBlocks not deference a machine mem operand if there isn't one present. ...

Eric Christopher informed me that FastISel memcpy handling creates
load/store instructions without mem operands. We should fix that,
but I doubt that's the only case of missed mem operands so seems
better to be defensive here.

I don't have a test case yet, but I'll try to add one if i get a
test from Eric.

2020-06-24 00:13:58 -07:00

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