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On X86, the Intel asm parser tries to match all memory operand sizes when none is explicitly specified. For LEA, which doesn't really have a memory operand (just a pointer one), this results in multiple successful matches, one for each memory size. There's no error because it's same opcode, so really, it's just one match. However, the tablegen'd matcher function adds opcode/operands to the passed MCInst, and this results in multiple duplicated operands. This commit clears the MCInst in the tablegen'd matcher function. We sometimes clear it when the match failed, so there's no expectation of keeping the previous content anyway. Differential Revision: http://reviews.llvm.org/D6670 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224347 91177308-0d34-0410-b5e6-96231b3b80d8
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