Reland "[Clang][CodeGen] Report when an alias points to an incompatible target" (#195550) This relands #192397, which was reverted in #194106. The new version includes the following fixes: - Set an explicit triple in the `attr-alias.m` test because aliases are not supported on Darwin. - Relax the check to only diagnose mismatches in return types and parameter lists, while ignoring exception specifications and other attributes. Original description follows: Add checks to ensure that an alias and its target have compatible types: - Generate an error if a function alias points to a variable or vice versa. - Issue a warning for mismatches in function types. - Ignore type discrepancies for variables. This behavior aligns with similar diagnostics in GCC. Resolves: #47301
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