anv/pipeline: Lower pipeline layouts etc. after linking

This allows us to use the link-optimized shader for determining binding
table layouts and, more importantly, URB layouts.  For apps running on
DXVK, this is extremely important as DXVK likes to declare max-size
inputs and outputs and this lets is massively shrink our URB space
requirements.

VkPipeline-db results (Batman pipelines only) on KBL:

    total instructions in shared programs: 820403 -> 790008 (-3.70%)
    instructions in affected programs: 273759 -> 243364 (-11.10%)
    helped: 622
    HURT: 42

    total spills in shared programs: 8449 -> 5212 (-38.31%)
    spills in affected programs: 3427 -> 190 (-94.46%)
    helped: 607
    HURT: 2

    total fills in shared programs: 11638 -> 6067 (-47.87%)
    fills in affected programs: 5879 -> 308 (-94.76%)
    helped: 606
    HURT: 3

Looking at shaders by hand, it makes the URB between TCS and TES go from
containing 32 per-vertex varyings per tessellation shader pair to a more
reasonable 8-12.  For a 3-vertex patch, that's at least half the URB
space no matter how big the patch section is.

Reviewed-by: Timothy Arceri <[email protected]>

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