i386: Fix up some minor formatting issues and one inconsistency

i386: Fix up some minor formatting issues and one inconsistency

While looking at a proposed vendor backport, I've noticed some
formatting issues in x86-tune.def.  Also, in all spots m_GENERIC
comes last, except one recently changed, I think it is useful to have
m_GENERIC always last for consistency.

2021-12-01  Jakub Jelinek  <jakub@redhat.com>

	* config/i386/x86-tune.def (X86_TUNE_SCHEDULE,
	X86_TUNE_SSE_PARTIAL_REG_FP_CONVERTS_DEPENDENCY,
	X86_TUNE_MISALIGNED_MOVE_STRING_PRO_EPILOGUES): Formatting fixes.
	(X86_TUNE_USE_GATHER): Put m_GENERIC last for consistency.