ppc64 and ppc64le nightly cross gcc failures

[dkm]

https://github.com/compiler-explorer/compiler-workflows/actions/workflows//build-daily-powerpc64.yml
https://github.com/compiler-explorer/compiler-workflows/actions/workflows//build-daily-powerpc64le.yml

This is an ICE during GNAT runtime build.

325658   │ 2024-05-18T00:22:44.9120545Z [ALL  ]    +===========================GNAT BUG DETECTED==============================+
325659   │ 2024-05-18T00:22:44.9121396Z [ERROR]    | 15.0.0 20240516 (experimental) (powerpc64-unknown-linux-gnu) GCC error:  |
325660   │ 2024-05-18T00:22:44.9122215Z [ALL  ]    | in require, at machmode.h:313                                            |
325661   │ 2024-05-18T00:22:44.9123091Z [ALL  ]    | Error detected around s-valued.adb:196:27                                |
325662   │ 2024-05-18T00:22:44.9123957Z [ALL  ]    | Compiling s-vade128.ads                                                  |
325663   │ 2024-05-18T00:22:44.9124757Z [ALL  ]    | Please submit a bug report; see https://gcc.gnu.org/bugs/ .              |
325664   │ 2024-05-18T00:22:44.9125604Z [ALL  ]    | Use a subject line meaningful to you and us to track the bug.            |
325665   │ 2024-05-18T00:22:44.9126441Z [ALL  ]    | Include the entire contents of this bug box in the report.               |
325666   │ 2024-05-18T00:22:44.9127258Z [ALL  ]    | Include the exact command that you entered.                              |
325667   │ 2024-05-18T00:22:44.9128051Z [ALL  ]    | Also include sources listed below.                                       |
325668   │ 2024-05-18T00:22:44.9128725Z [ALL  ]    +==========================================================================+
325669   │ 2024-05-18T00:22:44.9129181Z [ALL  ]    
325670   │ 2024-05-18T00:22:44.9129562Z [ALL  ]    Please include these source files with error report
325671   │ 2024-05-18T00:22:44.9130169Z [ALL  ]    Note that list may not be accurate in some cases,
325672   │ 2024-05-18T00:22:44.9130761Z [ALL  ]    so please double check that the problem can still
325673   │ 2024-05-18T00:22:44.9131408Z [ALL  ]    be reproduced with the set of files listed.
325674   │ 2024-05-18T00:22:44.9131980Z [ALL  ]    Consider also -gnatd.n switch (see debug.adb).
325675   │ 2024-05-18T00:22:44.9132404Z [ALL  ]    
325676   │ 2024-05-18T00:22:44.9132637Z [ALL  ]    system.ads
325677   │ 2024-05-18T00:22:44.9132955Z [ALL  ]    s-vade128.ads
325678   │ 2024-05-18T00:22:44.9133240Z [ALL  ]    interfac.ads
325679   │ 2024-05-18T00:22:44.9133562Z [ALL  ]    s-arit128.ads
325680   │ 2024-05-18T00:22:44.9133839Z [ALL  ]    ada.ads
325681   │ 2024-05-18T00:22:44.9134191Z [ALL  ]    a-numeri.ads
325682   │ 2024-05-18T00:22:44.9134511Z [ALL  ]    a-nubinu.ads
325683   │ 2024-05-18T00:22:44.9134815Z [ALL  ]    a-nbnbig.ads
325684   │ 2024-05-18T00:22:44.9135128Z [ALL  ]    s-valued.ads
325685   │ 2024-05-18T00:22:44.9135439Z [ALL  ]    s-stalib.ads
325686   │ 2024-05-18T00:22:44.9135744Z [ALL  ]    a-unccon.ads
325687   │ 2024-05-18T00:22:44.9136045Z [ALL  ]    s-exctab.ads
325688   │ 2024-05-18T00:22:44.9136340Z [ALL  ]    s-assert.ads
325689   │ 2024-05-18T00:22:44.9136648Z [ALL  ]    a-assert.ads
325690   │ 2024-05-18T00:22:44.9136958Z [ALL  ]    a-except.ads
325691   │ 2024-05-18T00:22:44.9137315Z [ALL  ]    s-parame.ads
325692   │ 2024-05-18T00:22:44.9137621Z [ALL  ]    s-traent.ads
325693   │ 2024-05-18T00:22:44.9137921Z [ALL  ]    s-valued.adb
325694   │ 2024-05-18T00:22:44.9138233Z [ALL  ]    s-unstyp.ads
325695   │ 2024-05-18T00:22:44.9138541Z [ALL  ]    s-valuti.ads
325696   │ 2024-05-18T00:22:44.9138849Z [ALL  ]    s-casuti.ads
325697   │ 2024-05-18T00:22:44.9139157Z [ALL  ]    s-valspe.ads
325698   │ 2024-05-18T00:22:44.9139460Z [ALL  ]    s-valuer.ads
325699   │ 2024-05-18T00:22:44.9139774Z [ALL  ]    s-exnllli.ads
325700   │ 2024-05-18T00:22:44.9140094Z [ALL  ]    s-exponn.ads
325701   │ 2024-05-18T00:22:44.9140401Z [ALL  ]    s-valuer.adb
325702   │ 2024-05-18T00:22:44.9140662Z [ALL  ]    
325703   │ 2024-05-18T00:22:44.9140876Z [ALL  ]    
325704   │ 2024-05-18T00:22:44.9141272Z [ALL  ]    raised TYPES.UNRECOVERABLE_ERROR : comperr.adb:412

[dkm]

It's back on track, probably fixed.