8310727: C2: *_of() methods in PhaseIterGVN should use uint for the n…

…ode index

Reviewed-by: thartmann

src/hotspot/share/opto/phaseX.hpp

@@ -546,7 +546,7 @@ class PhaseIterGVN : public PhaseGVN {
   }
 
   // Replace ith edge of "n" with "in"
-  void replace_input_of(Node* n, int i, Node* in) {
+  void replace_input_of(Node* n, uint i, Node* in) {
     rehash_node_delayed(n);
     n->set_req_X(i, in, this);
   }
@@ -558,13 +558,13 @@ class PhaseIterGVN : public PhaseGVN {
   }
 
   // Delete ith edge of "n"
-  void delete_input_of(Node* n, int i) {
+  void delete_input_of(Node* n, uint i) {
     rehash_node_delayed(n);
     n->del_req(i);
   }
 
   // Delete precedence edge i of "n"
-  void delete_precedence_of(Node* n, int i) {
+  void delete_precedence_of(Node* n, uint i) {
     rehash_node_delayed(n);
     n->rm_prec(i);
   }