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[LegalizeDAG] Use MachinePointerInfo::getUnknownStack in place of…

Authored by craig.topper on May 16 2020, 3:48 PM.

Description

[LegalizeDAG] Use MachinePointerInfo::getUnknownStack in place of MachinePointerInfo() in a couple places. NFC

We know the pointer somewhere on the stack, we just don't know
exactly where since the index may be variable.

Differential Revision: https://reviews.llvm.org/D80060