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aco/optimizer: prevent any overflow between SGPR and const offset on MUBUF

Daniel Schürmann requested to merge daniel-schuermann/mesa:aco_mubuf_soffset into main 
Apparently, if the SGPR offset + const offset overflows,
it doesn't work.

Totals from 145 (0.11% of 134913) affected shaders: (GFX10.3)
SpillSGPRs: 134 -> 104 (-22.39%)
CodeSize: 1632676 -> 1645916 (+0.81%); split: -0.03%, +0.84%
Instrs: 316920 -> 320252 (+1.05%); split: -0.01%, +1.07%
Latency: 1456285 -> 1459686 (+0.23%); split: -0.02%, +0.25%
InvThroughput: 165785 -> 166086 (+0.18%); split: -0.02%, +0.20%
VClause: 6815 -> 6875 (+0.88%); split: -0.03%, +0.91%
SClause: 19089 -> 19079 (-0.05%); split: -0.06%, +0.01%
PreSGPRs: 7302 -> 7304 (+0.03%); split: -0.01%, +0.04%

Fixes: KHR-GL45.shader_storage_buffer_object.advanced-readWrite-case1-cs with zink

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