[PATCH] Fortran: fix passing of component ref to assumed-rank dummy [PR118683]

[Harald Anlauf]

Dear all,

the attached simple and obvious patch fixes an issue found when running
a UBSAN instrumented compiler on a recent testcase, see PR.  Also
verified when running f951 under gdb on that testcase.

I intend to commit within the next 24 hours unless there are comments.

Regtested on x86_64-pc-linux-gnu.

Will also backport to 14-branch, which has the same code.

Thanks,
Harald

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