PR 100170: Fix eq/ne tests on power10.

PR 100170: Fix eq/ne tests on power10.

This patch updates eq/ne tests in the testsuite to adjust the test if
power10 code generation is used.

2021-07-26  Michael Meissner  <meissner@linux.ibm.com>

gcc/testsuite/
	PR testsuite/100170
	* gcc.target/powerpc/ppc-eq0-1.c: Adjust insn counts if power10
	code is generated.
	* gcc.target/powerpc/ppc-ne0-1.c: (ne0): Adjust insn counts if
	power10 code is generated.
	(plus_ne0): Move to ppc-ne0-2.c.
	(cmp_plus_ne): Likewise.
	(plus_ne0_cmp): Likewise.
	* gcc.target/powerpc/ppc-ne0-2.c: New file.