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[AMDGPU] Always expand system scope fp atomics on gfx90a

Authored by rampitec on Mar 5 2021, 3:25 PM.

Description

[AMDGPU] Always expand system scope fp atomics on gfx90a

FP atomics in system scope cannot be used and shall always
be expanded in a CAS loop.

Differential Revision: https://reviews.llvm.org/D98085

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