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

runtime/vm/intrinsifier.cc

Index: runtime/vm/intrinsifier.cc
diff --git a/runtime/vm/intrinsifier.cc b/runtime/vm/intrinsifier.cc
index 1f50387abb0eecbc05913da551b9540b3f02b7b9..26573ce1098e26a1cb2370fe7d0bc1f8059d9b61 100644
--- a/runtime/vm/intrinsifier.cc
+++ b/runtime/vm/intrinsifier.cc
@@ -1160,6 +1160,16 @@ bool Intrinsifier::Build_DoubleRound(FlowGraph* flow_graph) {
 
   return BuildInvokeMathCFunction(&builder, MethodRecognizer::kDoubleRound);
 }
+
+
+void Intrinsifier::RegExp_ExecuteMatch(Assembler* assembler) {
+  IntrinsifyRegExpExecuteMatch(assembler, /*sticky=*/false);
+}
+
+
+void Intrinsifier::RegExp_ExecuteMatchSticky(Assembler* assembler) {
+  IntrinsifyRegExpExecuteMatch(assembler, /*sticky=*/true);
+}
 #endif  // !defined(TARGET_ARCH_DBC)