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[AMDGPU] Update OpenCL to use 48 bytes of implicit arguments for AMDGPU

Description

[AMDGPU] Update OpenCL to use 48 bytes of implicit arguments for AMDGPU

Add two additional implicit arguments for OpenCL for the AMDGPU target using the AMDHSA runtime to support device enqueue.

Differential Revision: https://reviews.llvm.org/D44697