[PATCH] aarch64: Fix ICE happening in SET_TYPE_VECTOR_SUBPARTS with libgccjit

[Antoni Boucher]

Hi.
This is a patch for the bug 117923.
I'd like to know if there's a simpler fix for this.
I tried keeping all the fields in the same struct and annotating the 
scalar fields as in:

enum GTY((skip)) machine_mode mode;

but it didn't fix the issue.
Any other ideas?

The following test suites passed for this patch:

  * The aarch64 tests.
  * The aarch64 regression tests.

Here are the test results:

                 === gcc Summary ===

# of expected passes            382150
# of unexpected failures        146
# of unexpected successes       16
# of expected failures          1946
# of unresolved testcases       48
# of unsupported tests          5465
/home/antoyo/gcc-build/build/gcc/xgcc  version 15.0.0 20241203 
(experimental) (GCC)

Same on the master branch:

# Comparing directories
## Dir1=/home/antoyo/tmp/gcc-compare/master/: 2 sum files
## Dir2=/home/antoyo/tmp/gcc-compare/fix-aarch64/: 2 sum files

# Comparing 2 common sum files
## /bin/sh ./contrib/compare_tests  /tmp/gxx-sum1.32352 /tmp/gxx-sum2.32352
# No differences found in 2 common sum files

I also ran the jit tests on Aarch64 with another patch and there are 
much less failures now.

Thanks for the review.
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