Shorter TryAllocate instruction sequence on ARM/ARM64/MIPS.

runtime/vm/flow_graph_compiler.h

Index: runtime/vm/flow_graph_compiler.h
diff --git a/runtime/vm/flow_graph_compiler.h b/runtime/vm/flow_graph_compiler.h
index b7b0cb64020bd7297c15bb0fd3055fa0a8cb5782..efb880499d211cb2e64e45b5076c9b51a3eb87cd 100644
--- a/runtime/vm/flow_graph_compiler.h
+++ b/runtime/vm/flow_graph_compiler.h
@@ -445,6 +445,7 @@ class FlowGraphCompiler : public ValueObject {
   void FinalizeStaticCallTargetsTable(const Code& code);
 
   const Class& double_class() const { return double_class_; }
+  const Class& mint_class() const { return mint_class_; }
   const Class& float32x4_class() const { return float32x4_class_; }
   const Class& float64x2_class() const { return float64x2_class_; }
   const Class& int32x4_class() const { return int32x4_class_; }
@@ -611,6 +612,7 @@ class FlowGraphCompiler : public ValueObject {
   bool may_reoptimize_;
 
   const Class& double_class_;
+  const Class& mint_class_;
   const Class& float32x4_class_;
   const Class& float64x2_class_;
   const Class& int32x4_class_;