* arm-tdep.c (convert_from_extended): New argument to hold the

* arm-tdep.c (convert_from_extended): New argument to hold the
type of floating point result we want to convert to.  Make input
argument const.  Fix all callers.
(convert_to_extended): Similarly.
(arm_extract_return_value): Now takes a regcache argument.  Change
code to use regcache accessor functions.  Correctly extract
smaller-than-word results on big-endian machines.
(arm_store_return_value): Now takes a regcache argument.  Change
code to use regcache accessor functions.  Correctly zero/sign extend
smaller than word results before storing into r0.
(arm_gdbarch_init): Register new-style extract_return_value and
store_return_value functions.