sanitizers(MSAN): Suppress toplevel bug

Bigarrays are printed in the toplevel as `<abstr>`, but ObjTbl.mem
computes a hash. However bigarrays are uninitialized when allocated,
so this seems to be a genuine bug:
```
==133712==WARNING: MemorySanitizer: use-of-uninitialized-value
    #0 0x4e6d11 in caml_ba_hash /var/home/edwin/git/ocaml/runtime/bigarray.c:486:45
    #1 0x52474a in caml_hash /var/home/edwin/git/ocaml/runtime/hash.c:251:35
    ocaml#2 0x599ebf in caml_interprete /var/home/edwin/git/ocaml/runtime/interp.c:1065:14
    ocaml#3 0x5a909a in caml_main /var/home/edwin/git/ocaml/runtime/startup_byt.c:575:9
    ocaml#4 0x540ccb in main /var/home/edwin/git/ocaml/runtime/main.c:37:3
    ocaml#5 0x7f0910abb087 in __libc_start_call_main (/lib64/libc.so.6+0x2a087) (BuildId: 8f53abaad945a669f2bdcd25f471d80e077568ef)
    ocaml#6 0x7f0910abb14a in __libc_start_main@GLIBC_2.2.5 (/lib64/libc.so.6+0x2a14a) (BuildId: 8f53abaad945a669f2bdcd25f471d80e077568ef)
    ocaml#7 0x441804 in _start (/var/home/edwin/git/ocaml/runtime/ocamlrun+0x441804) (BuildId: 7a60eef57e1c2baf770bc38d10d6c227e60ead37)

  Uninitialized value was created by a heap allocation
    #0 0x47d306 in malloc (/var/home/edwin/git/ocaml/runtime/ocamlrun+0x47d306) (BuildId: 7a60eef57e1c2baf770bc38d10d6c227e60ead37)
    #1 0x4e7960 in caml_ba_alloc /var/home/edwin/git/ocaml/runtime/bigarray.c:246:12
    ocaml#2 0x4e801f in caml_ba_create /var/home/edwin/git/ocaml/runtime/bigarray.c:673:10
    ocaml#3 0x59b8fc in caml_interprete /var/home/edwin/git/ocaml/runtime/interp.c:1058:14
    ocaml#4 0x5a909a in caml_main /var/home/edwin/git/ocaml/runtime/startup_byt.c:575:9
    ocaml#5 0x540ccb in main /var/home/edwin/git/ocaml/runtime/main.c:37:3
    ocaml#6 0x7f0910abb087 in __libc_start_call_main (/lib64/libc.so.6+0x2a087) (BuildId: 8f53abaad945a669f2bdcd25f471d80e077568ef)
    ocaml#7 0x7f0910abb14a in __libc_start_main@GLIBC_2.2.5 (/lib64/libc.so.6+0x2a14a) (BuildId: 8f53abaad945a669f2bdcd25f471d80e077568ef)
    ocaml#8 0x441804 in _start (/var/home/edwin/git/ocaml/runtime/ocamlrun+0x441804) (BuildId: 7a60eef57e1c2baf770bc38d10d6c227e60ead37)

SUMMARY: MemorySanitizer: use-of-uninitialized-value /var/home/edwin/git/ocaml/runtime/bigarray.c:486:45 in caml_ba_hash
```

Suppress it for now until a solution is found.

The testsuite passes now:
```
Summary:
  1334 tests passed
   103 tests skipped
     0 tests failed
     0 tests not started (parent test skipped or failed)
     0 unexpected errors
  1437 tests considered
```

Signed-off-by: Edwin Török <[email protected]>

Author: edwintorok

tools/ci/inria/sanitizers/script

@@ -160,6 +160,11 @@ TSAN_OPTIONS="" $run_testsuite
 # # Although if it is already available in $PATH this is not needed
 # # export MSAN_SYMBOLIZER_PATH=/usr/lib/llvm-18.0/bin/llvm-symbolizer
 
+# Printing a bigarray in a toplevel calls `caml_ba_hash`, due to ObjTbl.mem,
+# but bigarrays are uninitialized on allocation, so this is a genuine report.
+# Suppress it for now as there is no obvious solution for it.
+export OCAMLTEST_SKIP_TESTS="tests/parsing/multi_indices.ml"
+
 # # Build the system (bytecode only) and test
-# make $jobs
-# $run_testsuite
+make $jobs
+$run_testsuite