aarch64: Fix return register handling in untyped_call

While working on another patch, I hit a problem with the aarch64
expansion of untyped_call.  The expander emits the usual:

  (set (mem ...) (reg resN))

instructions to store the result registers to memory, but it didn't
say in RTL where those resN results came from.  This eventually led
to a failure of gcc.dg/torture/stackalign/builtin-return-2.c,
via regrename.

This patch turns the untyped call from a plain call to a call_value,
to represent that the call returns (or might return) a useful value.
The patch also uses a PARALLEL return rtx to represent all the possible
return registers.

gcc/
	* config/aarch64/aarch64.md (untyped_call): Emit a call_value
	rather than a call.  List each possible destination register
	in the call pattern.

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