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

runtime/vm/intermediate_language_arm.cc

Index: runtime/vm/intermediate_language_arm.cc
diff --git a/runtime/vm/intermediate_language_arm.cc b/runtime/vm/intermediate_language_arm.cc
index fa3a2611b59a90b6971ed821e4a2d19fa2249e7c..e02c2e7cc1d4851b7b06a22bff2eccbae0a0e7e0 100644
--- a/runtime/vm/intermediate_language_arm.cc
+++ b/runtime/vm/intermediate_language_arm.cc
@@ -6964,8 +6964,9 @@ void AllocateObjectInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
 
 void DebugStepCheckInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   ASSERT(!compiler->is_optimizing());
-  compiler->GenerateCall(
-      token_pos(), *StubCode::DebugStepCheck_entry(), stub_kind_, locs());
+  __ BranchLinkPatchable(*StubCode::DebugStepCheck_entry());
+  compiler->AddCurrentDescriptor(stub_kind_, Thread::kNoDeoptId, token_pos());
+  compiler->RecordSafepoint(locs());
 }