OpenCL Extended Instruction Set Specification defines relations between return/operand types and pointee type of pointer arguments in case of remquo, fract, frexp, lgamma_r, modf, sincos and prefetch instructions (https://registry.khronos.org/SPIR-V/specs/unified1/OpenCL.ExtendedInstructionSet.100.html). This PR ensures correct pointee types of those OpenCL Extended Instructions' pointer arguments.