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.
------------- Commit messages: - 8264623: Change to Xcode 12.4 for building on Macos at Oracle Changes: https://git.openjdk.java.net/jdk/pull/3388/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3388&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8264623 Stats: 15 lines in 1 file changed: 12 ins; 0 del; 3 mod Patch: https://git.openjdk.java.net/jdk/pull/3388.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/3388/head:pull/3388 PR: https://git.openjdk.java.net/jdk/pull/3388
