s390 fails to build #28866

[  312s]   g++-7 -o /home/abuild/rpmbuild/BUILD/node-v12.7.0/out/Release/obj.target/v8_compiler
/deps/v8/src/compiler/backend/instruction-selector.o ../deps/v8/src/compiler/backend/instructio
n-selector.cc '-DNODE_OPENSSL_CERT_STORE' '-DV8_GYP_BUILD' '-DV8_TYPED_ARRAY_MAX_SIZE_IN_HEAP=6
4' '-DOPENSSL_THREADS' '-DV8_TARGET_ARCH_S390' '-DV8_EMBEDDER_STRING="-node.16"' '-DENABLE_DISA
SSEMBLER' '-DV8_PROMISE_INTERNAL_FIELD_COUNT=1' '-DENABLE_MINOR_MC' '-DV8_INTL_SUPPORT' '-DV8_U
SE_SNAPSHOT' '-DV8_CONCURRENT_MARKING' '-DV8_EMBEDDED_BUILTINS' '-DV8_USE_SIPHASH' '-DDISABLE_U
NTRUSTED_CODE_MITIGATIONS' '-DV8_WIN64_UNWINDING_INFO' '-DUCONFIG_NO_SERVICE=1' '-DU_ENABLE_DYL
OAD=0' '-DU_STATIC_IMPLEMENTATION=1' '-DU_HAVE_STD_STRING=1' '-DUCONFIG_NO_BREAK_ITERATION=0' -
I../deps/v8 -I../deps/v8/include -I/home/abuild/rpmbuild/BUILD/node-v12.7.0/out/Release/obj/gen
/generate-bytecode-output-root -I/home/abuild/rpmbuild/BUILD/node-v12.7.0/out/Release/obj/gen/t
orque-output-root -I../deps/icu-small/source/i18n -I../deps/icu-small/source/common  -pthread -
Wno-unused-parameter -m31 -march=z196 -Wno-return-type -march=z196 -fno-strict-aliasing -m31 -O
3 -fno-omit-frame-pointer -flto=4 -fuse-linker-plugin -ffat-lto-objects -fdata-sections -ffunct
ion-sections -O3 -fno-rtti -fno-exceptions -std=gnu++1y -MMD -MF /home/abuild/rpmbuild/BUILD/no
de-v12.7.0/out/Release/.deps//home/abuild/rpmbuild/BUILD/node-v12.7.0/out/Release/obj.target/v8
_compiler/deps/v8/src/compiler/backend/instruction-selector.o.d.raw  -fmessage-length=0 -grecor
d-gcc-switches -fstack-protector -O2 -Wall -D_FORTIFY_SOURCE=2 -funwind-tables -fasynchronous-u
nwind-tables -fstack-clash-protection -Wno-class-memaccess -c
[  312s] In file included from ../deps/v8/src/reloc-info.h:10:0,
[  312s]                  from ../deps/v8/src/compiler/common-operator.h:13,
[  312s]                  from ../deps/v8/src/compiler/backend/instruction.h:15,
[  312s]                  from ../deps/v8/src/compiler/backend/instruction-scheduler.h:8,
[  312s]                  from ../deps/v8/src/compiler/backend/instruction-selector.h:10,
[  312s]                  from ../deps/v8/src/compiler/backend/instruction-selector.cc:5:
[  312s] ../deps/v8/src/objects/code.h:423:2: error: #error Unknown architecture.
[  312s]  #error Unknown architecture.
[  312s]   ^~~~~