r4773: Handle arrays of scalar types as function arguments.

r4773: Handle arrays of scalar types as function arguments.

Add hf for function return value.

Rename struct field members to be named after the structure name
and element name rather than element name and element type.

Remember which structure or function we are processing and use it
to generate hf fields according to the naming scheme above.
(This used to be commit fd14622d132c3f2dfd837ea7beccd0fc11a6bf3e)