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lavapipe: run optimize loop before krangling pipeline layout

Mike Blumenkrantz requested to merge zmike/mesa:lavapipe-hrrrrrrrrrrrrrrrrrrrnnnnnngggggggggggggggggggggggghhhhhhhhhhhhhhhh into main

in scenarios like:

vec1 32 ssa_151 = deref_var &shadow_map (uniform sampler2D)
vec1 32 ssa_152 = deref_var &shadow_map (uniform sampler2D)
vec2 32 ssa_153 = vec2 ssa_151, ssa_152
vec1 32 ssa_154 = deref_var &param@4 (function_temp uvec2)
intrinsic store_deref (ssa_154, ssa_153) (wrmask=xy /*3*/, access=0)
vec1 32 ssa_160 = deref_var &param@4 (function_temp uvec2)
vec2 32 ssa_164 = intrinsic load_deref (ssa_160) (access=0)
vec1 32 ssa_167 = mov ssa_164.x
vec1 32 ssa_168 = deref_cast (texture2D *)ssa_167 (uniform texture2D)  /* ptr_stride=0, align_mul=0, align_offset=0 */
vec1 32 ssa_169 = mov ssa_164.y
vec1 32 ssa_170 = deref_cast (sampler *)ssa_169 (uniform sampler)  /* ptr_stride=0, align_mul=0, align_offset=0 */
vec1 32 ssa_172 = (float32)tex ssa_168 (texture_deref), ssa_170 (sampler_deref), ssa_171 (coord), ssa_166 (comparator)

the real variable is stored to a function_temp and then loaded back again, which means it isn't a direct deref and lower_vri_instr_tex_deref() will crash because the variable can't be found

for #5945 (closed)

Edited by Mike Blumenkrantz

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