[Flang-new][OpenMP] Add bitcode files for AMD GPU OpenMP (#96742) Flang-new needs to add `mlink-builtin-bitcode` objects to properly support offload code generation for AMD GPUs (for example, math functions). Both Flang-new and Clang rely on `mlink-builtin-bitcode` flags. These flags are added by the `AMDGPUOpenMPToolchain::addClangTargetOptions` function. Now, both compilers reuse the same function. Flang-new tests for AMDGPU were updated by adding the `-nogpulib` flag. This flag allows running AMDGPU tests on machines without the ROCm stack.
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