[SPIR-V] Add lowering for G_FPOWI (#185454) This fixes an assertion I was hitting in the fragment density map sample in Vulkan Samples. In starfield.frag.hlsl, we have float starCol = pow((rnd - threshhold) / (1.0 - threshhold), 16.0); The optimizer recognizes 16.0 as a whole number and converts the call to `llvm.powi`. The backend goes on to fail with: fatal error: error in backend: cannot select: %46:fid(s64) = nnan ninf nsz arcp afn reassoc G_FPOWI %44:fid, %45:iid(s64) (in function: _Z9starFieldDv3_f) On Vulkan, there is no integer-exponent for pow. This patch lowers it by converting the exponent to float and calling GLSL.std.450's Pow. --------- Co-authored-by: Steven Perron <stevenperron@google.com>
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