32-bit xsave for signal frame update targets the wrong address and clobbers fpu state

I am getting the following test failures on glinux for -m32, both for debug:

The following tests FAILED:
         74 - code_api|linux.bad-signal-stack (Failed)
        159 - code_api|client.signal (Failed)
        299 - code_api|api.static_sideline_FLAKY (Failed)
Errors while running CTest

... and the following ones for release:

The following tests FAILED:
          1 - unit_tests (Failed)
         38 - code_api|linux.signal0000 (Failed)
         39 - code_api|linux.signal0001 (Failed)
         40 - code_api|linux.signal0010 (Failed)
         41 - code_api|linux.signal0011 (Failed)
         42 - code_api|linux.signal0100 (Failed)
         43 - code_api|linux.signal0101 (Failed)
         44 - code_api|linux.signal0110 (Failed)
         45 - code_api|linux.signal0111 (Failed)
         46 - code_api|linux.signal1000 (Failed)
         47 - code_api|linux.signal1001 (Failed)
         48 - code_api|linux.signal1010 (Failed)
         49 - code_api|linux.signal1011 (Failed)
         50 - code_api|linux.signal1100 (Failed)
         51 - code_api|linux.signal1101 (Failed)
         52 - code_api|linux.signal1110 (Failed)
         53 - code_api|linux.signal1111 (Failed)
         54 - code_api|linux.sigplain000 (Failed)
         55 - code_api|linux.sigplain001 (Failed)
         56 - code_api|linux.sigplain010 (Failed)
         57 - code_api|linux.sigplain011 (Failed)
         58 - code_api|linux.sigplain100 (Failed)
         59 - code_api|linux.sigplain101 (Failed)
         60 - code_api|linux.sigplain110 (Failed)
         61 - code_api|linux.sigplain111 (Failed)
         89 - code_api|pthreads.ptsig (Failed)
        158 - code_api|client.signal (Failed)
        296 - code_api|api.static_sideline_FLAKY (Failed)
Errors while running CTest