Refactored PMREM blur shader due to apparent compiler bug #18935
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…t compiler bug observed on Intel HD Graphics 630 GPU
This was referenced Mar 20, 2020
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Without this fix, the PMREM generator would cause context loss (and my entire display to go black for a bit) on my laptop. Its GPU is the Intel HD Graphics 630. We originally thought this was a model-viewer issue, but this was the root cause.
Fixes #18936