[stable/20250402] Cherry-pick https://github.com/swiftlang/llvm-project/pull/9212 #10720
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This reverts commit 76cfe6c. Only running `ActOnEndOfTranslationUnit` when `enableIncrementalProcessing` was false was the only NFC part of splitting `-fincremental-extensions` and `enableIncrementalProcessing` again (68090ee). LLDB started failing after that change with: ``` /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX11.3.sdk/usr/include/c++/v1/cstdlib:127:9: error: declaration of 'calloc' must be imported from module 'Darwin.malloc._malloc' before it is required ``` Reverting that part of the change fixed LLDB and didn't cause any other test failures, so happy days. Unfortunately most of what `Sema::ActOnEndOfTranslationUnit` does is additional diagnostics, which don't make a lot of sense from the Clang Importer in Swift. So this ends up being a significant regression if eg. `-warnings-as-errors` is enabled. Resolves rdar://116194950. (cherry picked from commit eed23a1)
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Cherry-picks the reverts from #7567 again, as this issue still isn't fixed.