instead of inside the optimization loop

Totals from 2504 (1.67% of 150170) affected shaders: (GFX10.3)
VGPRs: 162592 -> 162416 (-0.11%); split: -0.12%, +0.01%
CodeSize: 18399756 -> 18383552 (-0.09%); split: -0.10%, +0.01%
MaxWaves: 42654 -> 42748 (+0.22%)
Instrs: 3499404 -> 3497075 (-0.07%); split: -0.08%, +0.01%
Latency: 87087238 -> 87064270 (-0.03%); split: -0.06%, +0.03%
InvThroughput: 21159621 -> 21150546 (-0.04%); split: -0.05%, +0.01%
VClause: 56653 -> 56667 (+0.02%); split: -0.00%, +0.03%
Copies: 226332 -> 226423 (+0.04%); split: -0.15%, +0.19%
Branches: 110027 -> 110025 (-0.00%); split: -0.05%, +0.04%
PreSGPRs: 168087 -> 168076 (-0.01%); split: -0.01%, +0.00%
PreVGPRs: 160814 -> 160705 (-0.07%)

Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <!12061>