Use field type value-numbering local field stores

Use field type value-numbering local field stores

Method `VNPairApplySelectorsAssign` takes the type of the value being
assigned, so when processing a store to a field of a local struct, pass
the type of the field rather than the type of the local; failure to do so
was blocking propagation of the value number to subsequent loads of the
same field due to the type mismatch.

Commit migrated from https://github.com/dotnet/coreclr/commit/ae3f036d1527dddc399a15da6151661143e2948a