When building with ubsan on linuxppc64le we run into the issue below; seems some initialization is missing.
 
/jdk/src/hotspot/share/opto/output.cpp:1002:18: runtime error: load of value 171, which is not a valid value for type 'bool'
    #0 0x7fff8f52b71c in PhaseOutput::Process_OopMap_Node(MachNode*, int) (/jdk/lib/server/libjvm.so+0x74cb71c)
    #1 0x7fff8f530ab4 in PhaseOutput::fill_buffer(C2_MacroAssembler*, unsigned int*) (/jdk/lib/server/libjvm.so+0x74d0ab4)
    #2 0x7fff8f53c740 in PhaseOutput::Output() (/jdk/lib/server/libjvm.so+0x74dc740)
    #3 0x7fff8d5b6350 in Compile::Code_Gen() (/jdk/lib/server/libjvm.so+0x5556350)
    #4 0x7fff8d5be730 in Compile::Compile(ciEnv*, ciMethod*, int, Options, DirectiveSet*) (/jdk/lib/server/libjvm.so+0x555e730)
    #5 0x7fff8cfe7434 in C2Compiler::compile_method(ciEnv*, ciMethod*, int, bool, DirectiveSet*) (/jdk/lib/server/libjvm.so+0x4f87434)
    #6 0x7fff8d5e3bf4 in CompileBroker::invoke_compiler_on_method(CompileTask*) (/jdk/lib/server/libjvm.so+0x5583bf4)
    #7 0x7fff8d5e5a74 in CompileBroker::compiler_thread_loop() (/jdk/lib/server/libjvm.so+0x5585a74)
    #8 0x7fff8d6403c0 in CompilerThread::thread_entry(JavaThread*, JavaThread*) (/jdk/lib/server/libjvm.so+0x55e03c0)
    #9 0x7fff8e428810 in JavaThread::thread_main_inner() (/jdk/lib/server/libjvm.so+0x63c8810)
    #10 0x7fff900992e8 in Thread::call_run() (/jdk/lib/server/libjvm.so+0x80392e8)
    #11 0x7fff8f4a6a08 in thread_native_entry(Thread*) (/jdk/lib/server/libjvm.so+0x7446a08)
    #12 0x7fff95139714 in start_thread (/lib64/libpthread.so.0+0x9714)
    #13 0x7fff944eb774 in __GI___clone (/lib64/libc.so.6+0x13b774)
   ... (rest of output omitted)