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glsl-in: Fix position propagation in lowering #2079
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When lowering `Select` expressions the position could be wrongfully
updated from `AccessBase { constant_index: false }` to
`AccessBase { constant_index: true }` this caused dynamic indexing
in an array behind a structure to fail if it was stored in a constant.
Furthermore the position could also be updated from `Rhs` to
`AccessBase`, this could cause issues because `AccessBase` doesn't
load variables (which `Rhs` does), so accessing a member from a
structure behind a pointer would return the wrong result.
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When lowering
Selectexpressions the position could be wrongfully updated fromAccessBase { constant_index: false }toAccessBase { constant_index: true }this caused dynamic indexing in an array behind a structure to fail if it was stored in a constant.Furthermore the position could also be updated from
RhstoAccessBase, this could cause issues becauseAccessBasedoesn't load variables (whichRhsdoes), so accessing a member from a structure behind a pointer would return the wrong result.