The JDK mainline build when using XCode 16 fails with:

* For target buildtools_create_symbols_javac__the.COMPILE_CREATE_SYMBOLS_batch:
Exception in thread "main" java.lang.ClassFormatError: StackMapTable format error: bad verification type
        at jdk.compiler/com.sun.tools.javac.Main.compile(Main.java:64)
        at jdk.compiler/com.sun.tools.javac.Main.main(Main.java:52)

XCode 16 is not an officially supported toolchain version in the JDK, but the way the build fails is unexpected.

This failure is consistently reproducible and so far has been reproduced on macosx aarch64 instances. We haven't yet tested this against a macosx x64 instance. For reference, the clang++ version shipped in this XCode 16 is:

clang++ --version
Apple clang version 16.0.0 (clang-1600.0.26.3)
Target: arm64-apple-darwin23.6.0
Thread model: posix
InstalledDir: /xcode-16/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin