[powerpc] [testsuite] reorder dg directives [PR106069]

[powerpc] [testsuite] reorder dg directives [PR106069]

The dg-do directive appears after dg-require-effective-target in
g++.target/powerpc/pr106069.C.  That doesn't work the way that was
presumably intended.  Both of these directives set dg-do-what, but
dg-do does so fully and unconditionally, overriding any decisions
recorded there by earlier directives.  Reorder the directives more
canonically, so that both take effect.

for  gcc/testsuite/ChangeLog

	PR target/106069
	* g++.target/powerpc/pr106069.C: Reorder dg directives.