Issue 1 extracted from #4750 by @jacobgorm

WGSL currently does not support vector >>= scalar operations, unlike other compound assignments such as /=. Please see "Binary arithmetic expressions with mixed scalar and vector operands" table: https://gpuweb.github.io/gpuweb/wgsl/#arithmetic-expr

The lack of support for mixed type >>= operation complicates code porting and readability. Supporting this could improve developer experience of WGSL.