[Bug target/91421] [10 Regression] runtime error: load of value 2463, which is not a valid value for type 'built_in_function' since r274119

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91421

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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             Target|                            |x86_64-*-*, i?86-*-*

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
So UBSAN doesn't work for bitfield enums?  Because the issue is certainly
"latent" and I don't see how we can fix it.  Which means -fstrict-enums would
be broken as well.

Note that function-code should likely be

union {
  enum built_in_function code_normal;
  /* enum target_fn */ int code_target;
  /* no FE builins */
};

with it now being a full 32bit field using a union is now possible.