Change Bool::Get to return a handle instead of a pointer to a raw object.

runtime/vm/flow_graph_compiler_ia32.cc

Index: runtime/vm/flow_graph_compiler_ia32.cc
diff --git a/runtime/vm/flow_graph_compiler_ia32.cc b/runtime/vm/flow_graph_compiler_ia32.cc
index 0a729a59598e1973f88b4265b2a35b82b6d5a22b..5a0ea79045ea831a40ffa7e250f7e8fc7633688f 100644
--- a/runtime/vm/flow_graph_compiler_ia32.cc
+++ b/runtime/vm/flow_graph_compiler_ia32.cc
@@ -634,11 +634,11 @@ void FlowGraphCompiler::GenerateInstanceOf(intptr_t token_pos,
     __ jmp(&done, Assembler::kNearJump);
   }
   __ Bind(&is_not_instance);
-  __ LoadObject(EAX, negate_result ? Bool::True() : Bool::False());
+  __ LoadObject(EAX, Bool::Get(negate_result));
   __ jmp(&done, Assembler::kNearJump);
 
   __ Bind(&is_instance);
-  __ LoadObject(EAX, negate_result ? Bool::False() : Bool::True());
+  __ LoadObject(EAX, Bool::Get(!negate_result));
   __ Bind(&done);
   __ popl(EDX);  // Remove pushed instantiator type arguments.
   __ popl(ECX);  // Remove pushed instantiator.