8264623: Change to Xcode 12.4 for building on Macos at Oracle #3388
Switch to Xcode 12.4 for building macosx-x64 at Oracle. The new lldb dependency is needed to ensure that we can collect information when testing on older versions of macOS which do not support Xcode 12.4.
@vidmik This change now passes all automated pre-integration checks.
After integration, the commit message for the final commit will be:
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Pushed as commit 27f4b27.