Fix lclvar "cloning" in const division lowering

Fix lclvar "cloning" in const division lowering

The existing code was creating new uses of existing variables using the type of the division operation instead of the type of the existing variable use. There is one rare case when this does not work properly:
* if the variable is "normalize on load" (that implies that it is also a small int type variable)
* and if the variable is previously assigned to such that a subrange assertion is generated
* and if morph decides not to insert the load normalization cast due to the subrange assertion
* and if the variable is not enregistered
Then the assignment stores 2 bytes to the stack location but the uses generated by the division lowering code read 4 bytes because they have TYP_INT.

Commit migrated from https://github.com/dotnet/coreclr/commit/b27167e3e89d51cc6901275eb68289631ae72aa4