Long Vector Execution Tests: WaveMulti*

[alsepkow]

This issue captures adding long vector execution tests for the WaveOps intrinsics

The most recent Long Vector test plan document should be referenced when implementing: Long Vector Test Plan

Must be robust to different wave widths. Also need to deal with helper lanes in pixel shaders. Need testing in compute shaders. Might need to test in DXR shaders too.

Intrinsic	Function Signature	Operand Type(s)	Return Type	Notes
WaveMultiPrefixBitAnd	T WaveMultiPrefixBitAnd(T expr, uint mask)	int, uint (+vectors), mask	same as T	Bitwise AND prefix within subgroups
WaveMultiPrefixBitOr	T WaveMultiPrefixBitOr(T expr, uint mask)	int, uint (+vectors), mask	same as T	Bitwise OR prefix within subgroups
WaveMultiPrefixBitXor	T WaveMultiPrefixBitXor(T expr, uint mask)	int, uint (+vectors), mask	same as T	Bitwise XOR prefix within subgroups
WaveMultiPrefixProduct	T WaveMultiPrefixProduct(T expr, uint mask)	float, int, uint (+vectors)	same as T	Product prefix within subgroups
WaveMultiPrefixSum	T WaveMultiPrefixSum(T expr, uint mask)	float, int, uint (+vectors)	same as T	Sum prefix within subgroups