As part of the final cleanup of aarch64_internal_mov_immediate a return was

As part of the final cleanup of aarch64_internal_mov_immediate a return was
accidentally removed.  This causes the 2-instruction case to fallthrough
into the general case even when it found a match.  An example immediate is
0xcccccccccccccccd which was using 2 instructions in GCC5 but now requires 4.
Adding the return fixes the regressions.

2016-02-17  Wilco Dijkstra  <wdijkstr@arm.com>

    gcc/
	* config/aarch64/aarch64.c (aarch64_internal_mov_immediate):
	Add missing return.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@233490 138bc75d-0d04-0410-961f-82ee72b054a4