Oh, this is a fun failure:

* For target hotspot_variant-server_libjvm_objs_ageTable.o:
In file included from /home/buildbot/worker/build-jdkX-linux/build/src/hotspot/share/utilities/globalDefinitions.hpp:514:0,
                 from /home/buildbot/worker/build-jdkX-linux/build/src/hotspot/share/memory/allocation.hpp:29,
                 from /home/buildbot/worker/build-jdkX-linux/build/src/hotspot/share/metaprogramming/primitiveConversions.hpp:28,
                 from /home/buildbot/worker/build-jdkX-linux/build/src/hotspot/share/oops/markWord.hpp:29,
                 from /home/buildbot/worker/build-jdkX-linux/build/src/hotspot/share/gc/shared/ageTable.hpp:28,
                 from /home/buildbot/worker/build-jdkX-linux/build/src/hotspot/share/gc/shared/ageTable.inline.hpp:28,
                 from /home/buildbot/worker/build-jdkX-linux/build/src/hotspot/share/gc/shared/ageTable.cpp:27:
/home/buildbot/worker/build-jdkX-linux/build/src/hotspot/share/utilities/align.hpp: In function 'constexpr T alignment_mask(T)':
/home/buildbot/worker/build-jdkX-linux/build/src/hotspot/cpu/arm/globalDefinitions_arm.hpp:61:20: error: 'asm' in 'constexpr' function
 #define BREAKPOINT __asm__ volatile ("bkpt")
                    ^
/home/buildbot/worker/build-jdkX-linux/build/src/hotspot/share/utilities/debug.hpp:59:5: note: in expansion of macro 'BREAKPOINT'
     BREAKPOINT; \
     ^~~~~~~~~~
/home/buildbot/worker/build-jdkX-linux/build/src/hotspot/share/utilities/debug.hpp:65:24: note: in expansion of macro 'vmassert'
   ... (rest of output omitted)