* c-common.c (disable_builtin_function): Rename variable n to
	new_disabled_builtin.
	* c-decl.c (duplicate_decls): Rename parameter decl to new_decl.
	Rename local variable old to old_decl.
	* gensupport.c (shift_output_template): Rename parameter old to src.
	* simplify-rtx.c (simplify_replace_rtx): Rename parameter oldx to
	old_rtx and newx to new_rtx.

From-SVN: r85175