VM: Optimize RegExp.matchAsPrefix(...) by generating a sticky RegExp specialization.

runtime/vm/intrinsifier_ia32.cc

Index: runtime/vm/intrinsifier_ia32.cc
diff --git a/runtime/vm/intrinsifier_ia32.cc b/runtime/vm/intrinsifier_ia32.cc
index 9b5cf1d49bae04903a199a326722ba16cbd39315..6c0f6a11fcb2a8a2be2b8d933a9dbae5d45d88b5 100644
--- a/runtime/vm/intrinsifier_ia32.cc
+++ b/runtime/vm/intrinsifier_ia32.cc
@@ -2230,7 +2230,8 @@ void Intrinsifier::TwoByteString_equality(Assembler* assembler) {
 }
 
 
-void Intrinsifier::RegExp_ExecuteMatch(Assembler* assembler) {
+void Intrinsifier::IntrinsifyRegExpExecuteMatch(Assembler* assembler,
+                                                bool sticky) {
   if (FLAG_interpret_irregexp) return;
 
   static const intptr_t kRegExpParamOffset = 3 * kWordSize;
@@ -2248,8 +2249,8 @@ void Intrinsifier::RegExp_ExecuteMatch(Assembler* assembler) {
   __ movl(EDI, Address(ESP, kStringParamOffset));
   __ LoadClassId(EDI, EDI);
   __ SubImmediate(EDI, Immediate(kOneByteStringCid));
-  __ movl(EAX, FieldAddress(EBX, EDI, TIMES_4,
-                            RegExp::function_offset(kOneByteStringCid)));
+  __ movl(EAX, FieldAddress(EBX, EDI, TIMES_4, RegExp::function_offset(
+                                                   kOneByteStringCid, sticky)));
 
   // Registers are now set up for the lazy compile stub. It expects the function
   // in EAX, the argument descriptor in EDX, and IC-Data in ECX.