[CIR][AMDGPU] Add lowering for amdgcn rsq builtins #2079
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This PR adds support for lowering of "__builtin_amdgcn_rsq*" amdgpu builtins to clangIR.
Followed similar lowering from reference clang->llvmir in clang/lib/CodeGen/TargetBuiltins/AMDGPU.cpp.