Make stdlib WaveActive* call WaveMask* (#1336)

This change makes the various `WaveActive*()` functions have default implementations that call `WaveMask*()` passing `WaveActiveMask()`. The new definitions will be used during CUDA code generation, which simplifies some of the duplication that was occuring in the `__target_intrinsic` modifiers.

This change does *not* add logic to make computation of `WaveGetActiveMask()` corect on CUDA, so these functions will still fail to provide the behavior that users need/expect. A future change will need to add logic to synthesize the value of `WaveGetActiveMask()` automatically.

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