[arm] Share constant pool entries in snapshot.

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index df1df79af378a0837ae086ec349d78b97a9b35fd..5bbd6d9810b1097deecd3632f5d9f02fd21e9c21 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -2623,6 +2623,9 @@ void Heap::CreateFixedStubs() {
   // The eliminates the need for doing dictionary lookup in the
   // stub cache for these stubs.
   HandleScope scope(isolate());
+  // Canonicalize handles, so that we can share constant pool entries pointing
+  // to code targets without dereferencing their handles.
+  CanonicalHandleScope canonical(isolate());
 
   // Create stubs that should be there, so we don't unexpectedly have to
   // create them if we need them during the creation of another stub.