Correct errors in sparc SImode popcount/clz patterns when 64-bit.

Correct errors in sparc SImode popcount/clz patterns when 64-bit.

	* config/sparc/sparc.md (popcount<mode>2, clz<mode>2): Split up into...
	(popcountdi2, popcountsi2, clzdi2, clzsi2): Explicit expanders, in the
	SI mode 64-bit code gen case explicitly zero-extend and truncate.
	(*popcount<mode>_sp64): Split up into...
	(*popcountdi_sp64, *popcountsi_64): Explicit instantiations, and in the
	SImode case use truncate.
	(*clzsi_sp64): Rewrite to use truncate, and let the expander emit the
	subtract so the compiler can optimize it.
	(SIDI): Remove unused mode iterator.

From-SVN: r179628