Improve GLSL coverage of boolean binary ops (#1335)

* Improve GLSL coverage of boolean binary ops

This change ensures that the `&&`, `||`, `&`, `|`, and `^` apply correctly to vectors of `bool` values when targetting GLSL.

Most of the changes are in the GLSL emit path, where the IR instructions for these operators are bottlenecked through a small set of helper routines to cover the different cases. In general:

* The vector variants of the operations are implemented by casting to `uint` vectors, performing bitwise ops, then casting back
* The scalar variants are handled by conveting the bitwise operations to their equivalent logical operator (the one interesting case there is bitwise `^` where the equivalent logical operation on `bool` is `!=`)

This change makes it clear that our IR really shouldn't have distinct opcodes for logical vs. bitwise and/or/xor, and instead should just have a single family of operations where the behavior differs based on the type of the operand. That is already *de facto* the way things work (a user can always write `&`, `|` and `^` and expect them to work on `bool` and vectors of `bool`), so that the GLSL output path has to deal with the overlap. Having two sets of IR ops here actually makes for more code instead of less.

* Fixups: review feedback and test ! operator

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