Integrate the Irregexp Regular Expression Engine.

runtime/vm/flow_graph_type_propagator.cc

Index: runtime/vm/flow_graph_type_propagator.cc
diff --git a/runtime/vm/flow_graph_type_propagator.cc b/runtime/vm/flow_graph_type_propagator.cc
index cce0c2a7259b9b7e4dab3c9f74dab46cbf22283b..0863a1625c676cf2dc267b837501738ed73f897f 100644
--- a/runtime/vm/flow_graph_type_propagator.cc
+++ b/runtime/vm/flow_graph_type_propagator.cc
@@ -7,6 +7,7 @@
 #include "vm/cha.h"
 #include "vm/bit_vector.h"
 #include "vm/il_printer.h"
+#include "vm/regexp_assembler.h"
 
 namespace dart {
 
@@ -709,6 +710,21 @@ CompileType ParameterInstr::ComputeType() const {
   }
 
   const Function& function = graph_entry->parsed_function().function();
+  if (function.IsIrregexpFunction()) {
+    // In irregexp functions, types of input parameters are known and immutable.
+    // Set parameter types here in order to prevent unnecessary CheckClassInstr
+    // from being generated.
+    switch (index()) {
+      case RegExpMacroAssembler::kParamStringIndex:
+        return CompileType::FromCid(function.regexp_cid());
+      case RegExpMacroAssembler::kParamStartOffsetIndex:
+        return CompileType::FromCid(kSmiCid);
+      default: UNREACHABLE();
+    }
+    UNREACHABLE();
+    return CompileType::Dynamic();
+  }
+
   LocalScope* scope = graph_entry->parsed_function().node_sequence()->scope();
   const AbstractType& type = scope->VariableAt(index())->type();
 
@@ -995,6 +1011,21 @@ CompileType LoadFieldInstr::ComputeType() const {
 }
 
 
+CompileType LoadCodeUnitsInstr::ComputeType() const {
+  switch (class_id()) {
+    case kOneByteStringCid:
+    case kExternalOneByteStringCid:
+    case kTwoByteStringCid:
+    case kExternalTwoByteStringCid:
+      return can_pack_into_smi() ? CompileType::FromCid(kSmiCid)
+                                 : CompileType::Int();
+    default:
+      UNIMPLEMENTED();
+      return CompileType::Dynamic();
+  }
+}
+
+
 CompileType BinaryInt32OpInstr::ComputeType() const {
   // TODO(vegorov): range analysis information shall be used here.
   return CompileType::Int();
@@ -1254,6 +1285,11 @@ CompileType MathMinMaxInstr::ComputeType() const {
 }
 
 
+CompileType CaseInsensitiveCompareUC16Instr::ComputeType() const {
+  return CompileType::FromCid(kBoolCid);
+}
+
+
 CompileType UnboxInstr::ComputeType() const {
   switch (representation()) {
     case kUnboxedDouble: