[5.10][Compile Time Constant Extraction] Extract from all macro expansions #70173
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Cherry-pick of #70104
Explanation: visit struct expanded from peer macro and declarations' all members for compile time constant extraction. Note that the change is much simpler comparing to the main branch PR as extraction in 5.10 doesn't support extracting from extensions to types not defined in the extraction scope.
Scope: compile time constant extraction where source file uses some macro
Main Branch PR: #70104
Resolves: rdar://118948638
Risk: Low, additive change to compile time constant extraction only
Reviewed By: @DougGregor, @artemcm
Testing: added test-cases to the test suite