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[AMDGPU] Skip calculating callee saved registers for entry function.

Description

[AMDGPU] Skip calculating callee saved registers for entry function.

Reviewers: arsenm

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

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D64596

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