[TTI][RISCV] Model cost of loading constants arms of selects and compares (#109824) This follows in the spirit of 7d82c99403f615f6236334e698720bf979959704, and extends the costing API for compares and selects to provide information about the operands passed in an analogous manner. This allows us to model the cost of materializing the vector constant, as some select-of-constants are significantly more expensive than others when you account for the cost of materializing the constants involved. This is a stepping stone towards fixing https://github.com/llvm/llvm-project/issues/109466. A separate SLP patch will be required to utilize the new API.
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