[PATCH, committed] PR 89639, fix testcase for targets without REAL128

[FX via Gcc-patches]

Attached patch pushed as cb48166e52c0f159eb80a0666c4847825e294ec0
Confirmed by Dave to make the testcase pass on hppa-unknown-linux-gnu

FX

0001-Fortran-Fix-test-on-targets-without-REAL128.patch
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