Fixes #194355 `VectorCombine::foldExtractExtract()` matches any constant-index `extractelement` operands, but it never verifies that they are in range for a fixed-width vector.
Fixes #194355 `VectorCombine::foldExtractExtract()` matches any constant-index `extractelement` operands, but it never verifies that they are in range for a fixed-width vector.