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[X86][AMX] Prohibit pointer cast on load.

Authored by LuoYuanke on Jan 9 2021, 10:06 PM.

Description

[X86][AMX] Prohibit pointer cast on load.

The load/store instruction will be transformed to amx intrinsics in the
pass of AMX type lowering. Prohibiting the pointer cast make that pass
happy.

Differential Revision: https://reviews.llvm.org/D94372

Details