[6.0 🍒][Compile Time Constant Extraction] Ensure macro-expanded declarations are visited in WMO #74712
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Cherry-pick of #74708
Explanation: When support for macro-expanded declarations was added to ConstExtract, it only ever applied to single-file compilation on a per-primary basis. Which means that the same code, when compiled in WMO, did not handle macro-generated extension declarations. This change brings WMO code-path in line with the per-primary extraction code path.
Risk: Low. WMO compilation will now match what happens per-primary in single-file compiles.
Testing: Automated test added to the compiler test suite.
Resolves rdar://130036855