Port and integrate the irregexp engine from V8

runtime/vm/intermediate_language.cc

Index: runtime/vm/intermediate_language.cc
diff --git a/runtime/vm/intermediate_language.cc b/runtime/vm/intermediate_language.cc
index ce6092afed4789b100a15d61c894a1700ec73bdd..5834dc13953c2f2a2f7ef16ba88b4b9b38163dd7 100644
--- a/runtime/vm/intermediate_language.cc
+++ b/runtime/vm/intermediate_language.cc
@@ -17,6 +17,7 @@
 #include "vm/object.h"
 #include "vm/object_store.h"
 #include "vm/os.h"
+#include "vm/regexp_assembler.h"
 #include "vm/resolver.h"
 #include "vm/scopes.h"
 #include "vm/stub_code.h"
@@ -371,6 +372,14 @@ bool LoadIndexedInstr::AttributesEqual(Instruction* other) const {
 }
 
 
+bool LoadCodeUnitsInstr::AttributesEqual(Instruction* other) const {
+  LoadCodeUnitsInstr* other_load = other->AsLoadCodeUnits();
+  ASSERT(other_load != NULL);
+  return (class_id() == other_load->class_id() &&
+          element_count() == other_load->element_count());
+}
+
+
 ConstantInstr::ConstantInstr(const Object& value) : value_(value) {
   // Check that the value is not an incorrect Integer representation.
   ASSERT(!value.IsBigint() || !Bigint::Cast(value).FitsIntoSmi());
@@ -461,6 +470,7 @@ GraphEntryInstr::GraphEntryInstr(const ParsedFunction* parsed_function,
       parsed_function_(parsed_function),
       normal_entry_(normal_entry),
       catch_entries_(),
+      indirect_entries_(),
       initial_definitions_(),
       osr_id_(osr_id),
       entry_count_(0),
@@ -2530,6 +2540,17 @@ void TargetEntryInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
 }
 
 
+LocationSummary* IndirectEntryInstr::MakeLocationSummary(
+    Isolate* isolate, bool optimizing) const {
+  return JoinEntryInstr::MakeLocationSummary(isolate, optimizing);
+}
+
+
+void IndirectEntryInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
+  JoinEntryInstr::EmitNativeCode(compiler);
+}
+
+
 LocationSummary* PhiInstr::MakeLocationSummary(Isolate* isolate,
                                                bool optimizing) const {
   UNREACHABLE();
@@ -3326,6 +3347,23 @@ const char* MathUnaryInstr::KindToCString(MathUnaryKind kind) {
   return "";
 }
 
+typedef RawBool* (*CaseInsensitiveCompareUC16Function) (
+    RawString* string_raw,
+    RawSmi* lhs_index_raw,
+    RawSmi* rhs_index_raw,
+    RawSmi* length_raw);
+
+
+extern const RuntimeEntry kCaseInsensitiveCompareUC16RuntimeEntry(
+    "CaseInsensitiveCompareUC16", reinterpret_cast<RuntimeFunction>(
+        static_cast<CaseInsensitiveCompareUC16Function>(
+        &IRRegExpMacroAssembler::CaseInsensitiveCompareUC16)), 4, true, false);
+
+
+const RuntimeEntry& CaseInsensitiveCompareUC16Instr::TargetFunction() const {
+  return kCaseInsensitiveCompareUC16RuntimeEntry;
+}
+
 
 MergedMathInstr::MergedMathInstr(ZoneGrowableArray<Value*>* inputs,
                                  intptr_t original_deopt_id,