[PATCH] Another small cleanup to the const_and_copies stack

[PATCH] Another small cleanup to the const_and_copies stack

2015-09-11  Jeff Law  <law@redhat.com>

	PR tree-optimization/47679
	* tree-ssa-dom.c (struct cond_equivalence): Update comment.
	* tree-ssa-scopedtables.h (class const_and_copies): Prefix data
	member with m_.  Update inline member functions as necessary.  Add
	toplevel comment.
	* tree-ssa-scopedtables.c: Update const_and_copies's member
	functions to use m_ prefix to access the stack.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@227697 138bc75d-0d04-0410-961f-82ee72b054a4