Building with -fno-omit-frame-pointer fails on i386 and s390x

s390x:

...
s390x-linux-gnu-gcc-9 ../sysdeps/s390/multiarch/utf8-utf32-z9.c -c -std=gnu11 -fgnu89-inline -pipe -O2 -g -O1 -Wall -Wwrite-strings -Wundef -Werror -fmerge-all-constants -frounding-math -fstack-protector-strong -Wstrict-prototypes -Wold-style-definition -fmath-errno -mlong-double-128 -fno-omit-frame-pointer -fPIC -U_FORTIFY_SOURCE -isystem /<<PKGBUILDDIR>>/debian/include -I../include -I/<<PKGBUILDDIR>>/build-tree/s390x-prof/iconvdata -I/<<PKGBUILDDIR>>/build-tree/s390x-prof -I../sysdeps/unix/sysv/linux/s390/s390-64 -I../sysdeps/unix/sysv/linux/wordsize-64 -I../sysdeps/unix/sysv/linux/s390/fpu -I../sysdeps/s390/fpu -I../sysdeps/unix/sysv/linux/s390 -I../sysdeps/s390/nptl -I../sysdeps/ieee754/ldbl-64-128 -I../sysdeps/ieee754/ldbl-opt -I../sysdeps/unix/sysv/linux/include -I../sysdeps/unix/sysv/linux -I../sysdeps/nptl -I../sysdeps/pthread -I../sysdeps/gnu -I../sysdeps/unix/inet -I../sysdeps/unix/sysv -I../sysdeps/unix -I../sysdeps/posix -I../sysdeps/s390/s390-64 -I../sysdeps/wordsize-64 -I../sysdeps/ieee754/dbl-64/wordsize-64 -I../sysdeps/s390/multiarch -I../sysdeps/s390 -I../sysdeps/ieee754/ldbl-128 -I../sysdeps/ieee754/dbl-64 -I../sysdeps/ieee754/flt-32 -I../sysdeps/ieee754 -I../sysdeps/generic -I.. -I../libio -I. -nostdinc -isystem /usr/lib/gcc/s390x-linux-gnu/9/include -isystem /<<PKGBUILDDIR>>/debian/include -D_LIBC_REENTRANT -include /<<PKGBUILDDIR>>/build-tree/s390x-prof/libc-modules.h -DMODULE_NAME=iconvdata -include ../include/libc-symbols.h -DPIC -DSHARED -DTOP_NAMESPACE=glibc -o /<<PKGBUILDDIR>>/build-tree/s390x-prof/iconvdata/utf8-utf32-z9.os -MD -MP -MF /<<PKGBUILDDIR>>/build-tree/s390x-prof/iconvdata/utf8-utf32-z9.os.dt -MT /<<PKGBUILDDIR>>/build-tree/s390x-prof/iconvdata/utf8-utf32-z9.os
In file included from ../sysdeps/s390/utf8-utf16-z9.c:333,
                 from ../sysdeps/s390/multiarch/utf8-utf16-z9.c:20:
../iconv/loop.c: In function ‘__from_utf8_loop_vx’:
../iconv/loop.c:345:1: error: %r11 cannot be used in asm here
  345 | }
      | ^
In file included from ../sysdeps/s390/utf8-utf32-z9.c:474,
                 from ../sysdeps/s390/multiarch/utf8-utf32-z9.c:20:
../iconv/loop.c: In function ‘__from_utf8_loop_etf3eh’:
../iconv/loop.c:345:1: error: %r11 cannot be used in asm here
  345 | }
      | ^
In file included from ../sysdeps/s390/utf16-utf32-z9.c:507,
                 from ../sysdeps/s390/multiarch/utf16-utf32-z9.c:20:
../iconv/loop.c: In function ‘__from_utf16_loop_vx_cu’:
../iconv/loop.c:345:1: error: %r11 cannot be used in asm here
  345 | }
      | ^
...

i386:
...
In file included from ../sysdeps/unix/sysv/linux/x86/pthread_mutex_timedlock.c:22:
../nptl/pthread_mutex_timedlock.c: In function ‘__pthread_mutex_clocklock_common’:
../nptl/pthread_mutex_timedlock.c:599:1: error: bp cannot be used in asm here
  599 | }
      | ^
...