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

Description

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

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/D44696