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[AMDGPU] Change the l1 flush instruction for AMDPAL/MESA3D.

Description

[AMDGPU] Change the l1 flush instruction for AMDPAL/MESA3D.

This commit changes which l1 flush instruction is used for AMDPAL and
MESA3d workloads to flush the entire l1 cache instead of just the
volatile lines.

Differential Revision: https://reviews.llvm.org/D55367

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