[Bug tree-optimization/107229] New: ICE at -O1 and -Os with "-ftree-vectorize": verify_gimple failed

["zhendong.su at inf dot ethz.ch" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107229

            Bug ID: 107229
           Summary: ICE at -O1 and -Os with "-ftree-vectorize":
                    verify_gimple failed
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zhendong.su at inf dot ethz.ch
  Target Milestone: ---

This appears to be a very recent regression as it doesn't seem to fail with the
build from Compiler Explorer. 

[541] % gcctk -v
Using built-in specs.
COLLECT_GCC=gcctk
COLLECT_LTO_WRAPPER=/local/suz-local/software/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/13.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-trunk/configure --disable-bootstrap
--enable-checking=yes --prefix=/local/suz-local/software/local/gcc-trunk
--enable-sanitizers --enable-languages=c,c++ --disable-werror --enable-multilib
--with-system-zlib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 13.0.0 20221012 (experimental) [master r13-3246-g1c0670c62fc] (GCC) 
[542] % 
[542] % gcctk -O1 small.c; ./a.out
[543] % 
[543] % gcctk -O1 -ftree-vectorize small.c
small.c: In function ‘main’:
small.c:9:5: error: invalid position or size operand to ‘bit_field_ref’
    9 | int main() {
      |     ^~~~
_ifc__17 = BIT_FIELD_REF <_ifc__16, 21, 0xffffffffffffffffffffffffffffffc0>;
during GIMPLE pass: ifcvt
small.c:9:5: internal compiler error: verify_gimple failed
0xf3b99a verify_gimple_in_cfg(function*, bool)
        ../../gcc-trunk/gcc/tree-cfg.cc:5649
0xdf9d17 execute_function_todo
        ../../gcc-trunk/gcc/passes.cc:2091
0xdfa2bb execute_todo
        ../../gcc-trunk/gcc/passes.cc:2145
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
[544] % 
[544] % cat small.c
int a, c;
struct {
  long d;
  int : 8;
  int : 27;
  int e : 21;
} f;
void g(int b) { a = a & 1; }
int main() {
  while (c)
    g(f.e);
  return 0;
}