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i965: Fix output register sizes when multiple variables share a slot.
ARB_enhanced_layouts allows multiple output variables to share the same
location - and these variables may not have the same sizes. For
example, consider these output variables:
// consume X/Y/Z components of 6 vectors
layout(location = 0) out vec3 a[6];
// consumes W component of the first vector
layout(location = 0, component = 3) out float b;
Looking at the first declaration, we see that VARYING_SLOT_VAR0 needs 24
components worth of space (vec3 padded out to a vec4, 4 * 6 = 24). But
looking at the second declaration, we would think that VARYING_SLOT_VAR0
needs only 4 components of space (a single float padded out to a vec4).
nir_setup_outputs() only considered the space requirements of the first
declaration it happened to see, so if 'float b' came first, it would
underallocate the output register space, causing brw_fs_validator.cpp
to assert fail about inst->dst.offset exceeding the register size.
Fixes Piglit's tests/spec/arb_enhanced_layouts/execution/component-layout/
vs-to-fs-array-interleave-single-location.shader_test.
Thanks to Tim Arceri for finding this bug and writing a test!
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>