[AMDGPU] Add intrinsic exposing s_alloc_vgpr (#163951) Make it possible to use `s_alloc_vgpr` at the IR level. This is a huge footgun and use for anything other than compiler internal purposes is heavily discouraged. The calling code must make sure that it does not allocate fewer VGPRs than necessary - the intrinsic is NOT a request to the backend to limit the number of VGPRs it uses (in essence it's not so different from what we do with the dynamic VGPR flags of the `amdgcn.cs.chain` intrinsic, it just makes it possible to use this functionality in other scenarios).
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