[Bug target/64011] Fail to compile pr48335-2.c on big-endian where bit insert instruction supported

[jiwang at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64011

--- Comment #2 from Jiong Wang <jiwang at gcc dot gnu.org> ---
the problem is we do overflow checking at the start of store_bit_field_1, but
that only check the situation where the field lies completely outside the
register, while there do have situation where the field lies partialy in the
register, we need to adjust bitsize for this partial overflow situation in
store_bit_field_using_insv.

will send out patch after testing ok