[ARC] Check for odd-even register when emitting double mac ops.

[ARC] Check for odd-even register when emitting double mac ops.

gcc/
	Claudiu Zissulescu  <claziss@synopsys.com>

	* config/arc/arc.md (maddsidi4_split): Don't use dmac if the
	destination register is not odd-even.
	(umaddsidi4_split): Likewise.

gcc/testsuite/
	Claudiu Zissulescu  <claziss@synopsys.com>

	* gcc.target/arc/tmac-3.c: New file.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@264736 138bc75d-0d04-0410-961f-82ee72b054a4