rs6000: Update direct-move* testcases

rs6000: Update direct-move* testcases

This fixes some testcases that the last fifteen or so patches broke.
In all these cases we no longer need to set VSX_REG_ATTR: the default
value of "wa" is correct.

gcc/testsuite/
	* gcc.target/powerpc/direct-move-double1.c (VSX_REG_ATTR): Delete.
	* gcc.target/powerpc/direct-move-double2.c: Ditto.
	* gcc.target/powerpc/direct-move-float1.c: Ditto.
	* gcc.target/powerpc/direct-move-float2.c: Ditto.
	* gcc.target/powerpc/direct-move-vint1.c: Ditto.
	* gcc.target/powerpc/direct-move-vint2.c: Ditto.

From-SVN: r271940