[AMDGPU] Use the AMDGPUToolChain when targeting C/C++ directly (#99687) Summary: The `getToolChain` pass uses the triple to determine which toolchain to create. Currently the `amdgcn-amd-amdhsa` triple maps to the `ROCmToolChain` which uses things expected to be provided by `ROCm`. This is neded for OpenCL, but directly targeting C++ does not want this since it's primarily being used for creating GPU runtime code. As far as I know I'm the only user of this, so this shouldn't change anything. Unfortunately, there's no good logic for detercting this, so I simply checked ahead of time if the input is either `foo.cl` or `-x cl foo.c` to choose between the two. This allows us to use the AMDGPU target normally, as otherwise it will error without passing `-nogpulib`.
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