Zero on tag jdk-20+26 fails to build on powerpc64le-linux-gnu:

In file included from /<<PKGBUILDDIR>>/src/hotspot/share/utilities/compilerWarnings.hpp:30,
                 from /<<PKGBUILDDIR>>/src/hotspot/share/utilities/debug.hpp:29,
                 from /<<PKGBUILDDIR>>/src/hotspot/share/memory/allocation.hpp:29,
                 from /<<PKGBUILDDIR>>/src/hotspot/share/classfile/classLoaderData.hpp:28,
                 from /<<PKGBUILDDIR>>/src/hotspot/share/precompiled/precompiled.hpp:34:
/<<PKGBUILDDIR>>/src/hotspot/share/runtime/continuationFreezeThaw.cpp: In constructor 'FreezeBase::FreezeBase(JavaThread*, ContinuationWrapper&, intptr_t*)':
/<<PKGBUILDDIR>>/src/hotspot/share/runtime/continuationFreezeThaw.cpp:488:64: error: 'abi_reg_args_size' is not a member of 'frame'
  488 | PPC64_ONLY(frame::abi_reg_args_size >> LogBytesPerWord);
      | ^~~~~~~~~~~~~~~~~
/<<PKGBUILDDIR>>/src/hotspot/share/utilities/macros.hpp:508:26: note: in definition of macro 'PPC64_ONLY'
  508 | #define PPC64_ONLY(code) code
      | ^~~~
gmake[3]: *** [make/Main.gmk:252: hotspot-zero-libs] Error 2
gmake[3]: *** Waiting for unfinished jobs....

complete build log at
https://launchpadlibrarian.net/639243760/buildlog_ubuntu-lunar-ppc64el.openjdk-20_20~26ea-1_BUILDING.txt.gz