ipa-reference.c: Do not include c-common.h, include splay-tree.h.

ipa-reference.c: Do not include c-common.h, include splay-tree.h.

	* ipa-reference.c: Do not include c-common.h, include splay-tree.h.
	* ipa-utils.c: Likewise.
	* ipa-type-escape.c: Likewise.
	* cgraphunit.c Do not include c-common.h.
	* ipa-pure-const.c: Likewise.
	* tree-if-conv.c: Likewise.
	* matrix-reorg.c: Do not include c-common.h and c-tree.h.
	* ipa-struct-reorg.c: Likewise.
	* tree-nomudflap.c: Likewise.
	* tree-ssa-structalias.c: Likewise.

From-SVN: r147035