8372163: G1: Remove unused G1HeapRegion::remove_code_root

Reviewed-by: tschatzl

Author: albertnetymk

src/hotspot/share/gc/g1/g1HeapRegion.cpp

@@ -307,10 +307,6 @@ void G1HeapRegion::add_code_root(nmethod* nm) {
   rem_set()->add_code_root(nm);
 }
 
-void G1HeapRegion::remove_code_root(nmethod* nm) {
-  rem_set()->remove_code_root(nm);
-}
-
 void G1HeapRegion::code_roots_do(NMethodClosure* blk) const {
   rem_set()->code_roots_do(blk);
 }

src/hotspot/share/gc/g1/g1HeapRegion.hpp

@@ -543,7 +543,6 @@ class G1HeapRegion : public CHeapObj<mtGC> {
   // Routines for managing a list of code roots (attached to the
   // this region's RSet) that point into this heap region.
   void add_code_root(nmethod* nm);
-  void remove_code_root(nmethod* nm);
 
   // Applies blk->do_nmethod() to each of the entries in
   // the code roots list for this region