[Bug target/67714] [6 Regression] signed char is zero-extended instead of sign-extended

[ktkachov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67714

--- Comment #10 from ktkachov at gcc dot gnu.org ---
Hi Nick,

For this failure (among others) I proposed the series at:
https://gcc.gnu.org/ml/gcc-patches/2016-01/msg01713.html

that changes the PROMOTE_MODE implementation on arm to be consistent with the
TARGET_PROMOTE_FUNCTION_MODE implementation i.e. to not do unsigned promotion
of short types