JIT: relax method attribute assertion check in devirtualization (#11730)

JIT: relax method attribute assertion check in devirtualization (#11730)

The jit may see `CORINFO_FLG_DONT_INLINE` change between the time it
first reads a method's attributes and the time it re-reads it, since
jitting on some other thread may have deduced the method as noinline
in between the two reads. This bit doesn't affect devirtualization
and so the bit change is harmless.

Tolerate this by masking out this flag bit when comparing attributes.

No changes to generated code.

Closes #11619.