[PATCH] Split ssa-dom-thread-2.c into separate files/tests

[PATCH] Split ssa-dom-thread-2.c into separate files/tests

	* gcc.dg/tree-ssa/ssa-dom-thread-2.c: Deleted.  The six functions
	contained within have their own file/test now.
	* gcc.dg/tree-ssa/ssa-dom-thread-2a.c: New test extracted from
	ssa-dom-thread-2.c.  Tighten expected output slightly and comment
	expectations a bit more.
	* gcc.dg/tree-ssa/ssa-dom-thread-2b.c: Likewise.
	* gcc.dg/tree-ssa/ssa-dom-thread-2c.c: Likewise.
	* gcc.dg/tree-ssa/ssa-dom-thread-2d.c: Likewise.
	* gcc.dg/tree-ssa/ssa-dom-thread-2e.c: Likewise.
	* gcc.dg/tree-ssa/ssa-dom-thread-2f.c: Likewise.

From-SVN: r228821