[Bug tree-optimization/78170] [7 Regression] wrong code at -O2 and -O3 on x86_64-linux-gnu

[ktkachov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78170

--- Comment #5 from ktkachov at gcc dot gnu.org ---
The problem is in encode_tree_to_bitpos.
It needs to take into account the padding that native_encode_expr may introduce
for sign-extended values for little-endian as well as big-endian.

Testing a patch