Alex Voicu 9a408588d1 [HIP][Clang][Driver] Add Driver support for hipstdpar ...

This patch adds the Driver changes needed for enabling HIP parallel algorithm offload on AMDGPU targets. What this change does can be summed up as follows:

- add two flags, one for enabling `hipstdpar` compilation, the second enabling the optional allocation interposition mode;
- the flags correspond to new LangOpt members;
- if we are compiling or linking with --hipstdpar, we enable HIP; in the compilation case C and C++ inputs are treated as HIP inputs;
- the ROCm / AMDGPU driver is augmented to look for and include an implementation detail forwarding header; we error out if the user requested `hipstdpar` but the header or its dependencies cannot be found.

Tests for the behaviour described above are also added.

Reviewed by: MaskRay, yaxunl

Differential Revision: https://reviews.llvm.org/D155775

2023-10-03 13:14:46 +01:00

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