spirv-fuzz: Transformation to inline pointer parameters

We can replace a pointer parameter with its scalar pointee if the parameter is not being written into.

The issue names a spirv-fuzz transformation but provides no source file, test, or entry point. Locate existing spirv-fuzz transformations involving function parameters, then determine how the stated replacement should be represented and tested; done means the transformation applies only when the pointer parameter is not written into.

Written by the indexing model from the issue text.