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

runtime/vm/intermediate_language_mips.cc

Index: runtime/vm/intermediate_language_mips.cc
diff --git a/runtime/vm/intermediate_language_mips.cc b/runtime/vm/intermediate_language_mips.cc
index e69534353de961ceb4e86fffb43b2d3e31c08569..e824df18862e5c411a9bf1cc4128604139ea1d92 100644
--- a/runtime/vm/intermediate_language_mips.cc
+++ b/runtime/vm/intermediate_language_mips.cc
@@ -5755,8 +5755,9 @@ 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());
 }