intel/compiler: make sure swizzle is applied to if condition

intel/compiler: make sure swizzle is applied to if condition

This fixes a hang in the following piglit test when GCM moves a
UBO load outside of the loop.

tests/shaders/ssa/fs-if-def-else-break.shader_test

The end NIR ends up looking like this:

	vec2 32 ssa_3 = intrinsic load_ubo (ssa_2, ssa_0) (0, 1073741824, 0, 0, 8)
	vec1 32 ssa_4 = mov ssa_3.x
	vec1 32 ssa_5 = inot ssa_3.y
	/* succs: block_1 */
	loop {
           ...
           if ssa_5 { }
        }

Fixes: 1edf67fc3f6b ("intel/fs: Generate if instructions with inverted conditions")

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12064>