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AMDGPU: Propagate undef flag during pre-RA exec mask optimizations

Description

AMDGPU: Propagate undef flag during pre-RA exec mask optimizations

Summary: Issue: https://github.com/GPUOpen-Drivers/llpc/issues/204

Reviewers: arsenm, rampitec

Subscribers: kzhuravl, jvesely, wdng, yaxunl, dstuttard, tpr, t-tye, hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D68184

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