[ARC] Update RTX costs.

[ARC] Update RTX costs.

Update RTX costs to reflect better the ARC architecture.

gcc/
xxxx-xx-xx  Claudiu Zissulescu  <claziss@synopsys.com>

	* config/arc/arc.c (arc_rtx_costs): Update costs.

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

	* gcc.target/arc/jumptables.c: Update test.

From-SVN: r272113