Add special case to TYPE_INT64's EmitAnd for UINT_MAX mask. Do mov32 to 32 if detected to take advantage of implicit zero xt/reg renaming
Add helper function for skipping assignment defs in instr.
Add helper function for checking if an opcode is binary value type
Add several new optimizations to simplificationpass, plus weak NZM calculation code (better full evaluation of Z/NZ will be done later) .
List of optimizations:
If a value is anded with a bitmask that it was already masked against, reuse the old value (this cuts out most FPSCR update garbage, although it does cause a local variable to be allocated for the masked FPSCR and it still repeatedly stores the masked value to the context)
If masking a value that was or'ed against another check whether our mask only considers bits from one value or another. if so, change the operand to the OR input that actually matters
If the only usage of a rotate left's output is an AND against a mask that discards the bits that were rotated in change the opcode to SHIFT_LEFT
If masking against all ones, become an assign.
If XOR or OR against 0, become an assign (additional FPSCR codegen cleanup)
If XOR against all ones, become a NOT
Adding a direct CPUID check to x64_emitter for lzcnt, the version of xbyak we are using is skipping checking for lzcnt on all non-intel cpus, meaning we are generating the much slower bitscan path for AMD cpus.
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