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Revert "[AArch64] Attempt to sink mul operands"

Authored by mstorsjo on Thu, Jan 14, 7:05 AM.

Description

Revert "[AArch64] Attempt to sink mul operands"

This reverts commit dda60035e9f0769c8907cdf6561489e0435c2275.

This commit caused failures to compile some sources, erroring out
with "error in backend: Cannot select: t85: v2i32 = AArch64ISD::DUP t15",
see https://reviews.llvm.org/D91271 for the full reproduction case.