VM+RISC: Share object pool entries for allocation stubs.

runtime/vm/flow_graph_compiler_arm.cc

Index: runtime/vm/flow_graph_compiler_arm.cc
diff --git a/runtime/vm/flow_graph_compiler_arm.cc b/runtime/vm/flow_graph_compiler_arm.cc
index 65de695b245330142f79a7741ed06dfed27b0a4c..97edd15d961843c51411f3419ab58100beea2c54 100644
--- a/runtime/vm/flow_graph_compiler_arm.cc
+++ b/runtime/vm/flow_graph_compiler_arm.cc
@@ -1119,7 +1119,7 @@ void FlowGraphCompiler::GenerateCall(TokenPosition token_pos,
                                      const StubEntry& stub_entry,
                                      RawPcDescriptors::Kind kind,
                                      LocationSummary* locs) {
-  __ BranchLinkPatchable(stub_entry);
+  __ BranchLink(stub_entry);
   AddCurrentDescriptor(kind, Thread::kNoDeoptId, token_pos);
   RecordSafepoint(locs);
 }