rs6000: Ignore fusion option flags for inlining test [PR102059]

rs6000: Ignore fusion option flags for inlining test [PR102059]

The -mpower8-fusion and -mpower10-fusion options do not modify which
instructions we can generate, so ignore them when deciding whether we
can inline callee into caller.

2022-05-06   Michael Meissner  <meissner@linux.ibm.com>

gcc/
	PR target/102059
	* config/rs6000/rs6000.cc (rs6000_can_inline_p): Ignore -mpower8-fusion
	and -mpower10-fusion options for inlining purposes.

gcc/testsuite/
	PR target/102059
	* gcc.target/powerpc/pr102059-4.c: New test.

(cherry picked from commit 2fb654f77d5292864ef57040f7bc01d7a975f6d9)