Mike Blumenkrantz
0a243a7241
this code is intended to transform a block like:
```
32 %306 = @load_interpolated_input (%34, %0 (0x0)) (base=3, component=2, dest_type=float32, io location=VARYING_SLOT_VAR3 slots=1)
32x2 %307 = fsub %305, %306.xx
```
into derefs. the existing code generates this:
```
decl_var shader_in INTERP_MODE_NONE none vec2 #7 (VARYING_SLOT_VAR3.zw, 0, 0)
32 %516 = deref_var  (shader_in vec2)
32x2 %517 = @load_deref (%516) (access=none)
32 %518 = mov %517.z
error: src->swizzle[i] < num_components (../src/compiler/nir/nir_validate.c:216)
```
the problem is attempting to reapply the component offset to a variable which is
already at an offset
fixes #10567
Fixes: 17a35412dc ("zink: re-rework i/o variable handling to make having variables entirely optional")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27522>
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