rs6000: ROP - Do not disable shrink-wrapping for leaf functions [PR114759]

rs6000: ROP - Do not disable shrink-wrapping for leaf functions [PR114759]

Only disable shrink-wrapping when using -mrop-protect when we know we
will be emitting the ROP-protect hash instructions (ie, non-leaf functions).

2024-06-17  Peter Bergner  <bergner@linux.ibm.com>

gcc/
	PR target/114759
	* config/rs6000/rs6000.cc (rs6000_override_options_after_change): Move
	the disabling of shrink-wrapping from here....
	* config/rs6000/rs6000-logue.cc (rs6000_emit_prologue): ...to here.

gcc/testsuite/
	PR target/114759
	* gcc.target/powerpc/pr114759-1.c: New test.