Add fast Smi op version of switchable instance calls.

runtime/vm/stub_code_ia32.cc

Index: runtime/vm/stub_code_ia32.cc
diff --git a/runtime/vm/stub_code_ia32.cc b/runtime/vm/stub_code_ia32.cc
index b6302d333ff25bfec3077ecb3f2197a6af2d4cd5..13499a93d8ce15d3b276983ba5ba01dd866a2f8f 100644
--- a/runtime/vm/stub_code_ia32.cc
+++ b/runtime/vm/stub_code_ia32.cc
@@ -2022,6 +2022,12 @@ void StubCode::GenerateOptimizedIdenticalWithNumberCheckStub(
 }
 
 
+// Called from megamorphic calls.
+//  EBX: receiver
+//  ECX: MegamorphicCache (preserved)
+// Result:
+//  EBX: target entry point
+//  EDX: argument descriptor
 void StubCode::EmitMegamorphicLookup(Assembler* assembler) {
   __ LoadTaggedClassIdMayBeSmi(EAX, EBX);
   // EAX: class ID of the receiver (smi).
@@ -2063,12 +2069,6 @@ void StubCode::EmitMegamorphicLookup(Assembler* assembler) {
 }
 
 
-// Called from megamorphic calls.
-//  EBX: receiver
-//  ECX: MegamorphicCache (preserved)
-// Result:
-//  EBX: target entry point
-//  EDX: argument descriptor
 void StubCode::GenerateMegamorphicLookupStub(Assembler* assembler) {
   EmitMegamorphicLookup(assembler);
   __ ret();
@@ -2085,6 +2085,21 @@ void StubCode::GenerateICLookupStub(Assembler* assembler) {
   __ int3();
 }
 
+
+void StubCode::GenerateICSmiAddLookupStub(Assembler* assembler) {
+  __ int3();
+}
+
+
+void StubCode::GenerateICSmiSubLookupStub(Assembler* assembler) {
+  __ int3();
+}
+
+
+void StubCode::GenerateICSmiEqualLookupStub(Assembler* assembler) {
+  __ int3();
+}
+
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32