Check universal rule for Aliased decorations

2.16.1 says "The Aliased Decoration can only be applied to intermediate objects that are pointers to non-void types."

Test all cases that can produce a pointer result id in the Logical Addressing model: OpVariable
OpAccessChain
OpInBoundsAccessChain
OpFunctionParameter
OpImageTexelPointer
OpCopyObject

Also, in physical addressing, result of:
Op*AccessChain, OpLoad. Others?

Start with the SPIR-V 2.16.1 rule for Aliased decorations and enumerate pointer-producing results in the Logical Addressing model: OpVariable, OpAccessChain, OpInBoundsAccessChain, OpFunctionParameter, OpImageTexelPointer, and OpCopyObject. Then check Op*AccessChain and OpLoad in physical addressing, determine whether other operations apply, and add coverage for every applicable case.

Written by the indexing model from the issue text.