[Bug target/95381] [11 Regression]: Bootstrap on m68k fails with ICE: in operator[], at vec.h:867

[law at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95381

--- Comment #6 from Jeffrey A. Law <law at redhat dot com> ---
That's an indication that something has tried to do an out of bounds read on a
VEC object.  The call chain points back to the initial quick_grow of an
auto_vec from test_vector_cst_patterns -- which is wildly surprising.

In fact if it were that broken I would fully expect other configurations,
including x86_64 to be failing miserably.  We're not seeing that.  I would also
expect that we could see the failure with a cross compiler, but that seems to
be working fine as well.

There's a nonzero chance this is actually a bug in the bootstrap compiler,
particularly if it's happening in the stage1 build.