Append the regexp pattern to the name of the generated irregexp function.

runtime/vm/regexp.cc

Index: runtime/vm/regexp.cc
diff --git a/runtime/vm/regexp.cc b/runtime/vm/regexp.cc
index 93e4997fc548edce12b6b28d04f6966f5a215281..a5d4fece801efed3927f35a1ae7e785686a6e889 100644
--- a/runtime/vm/regexp.cc
+++ b/runtime/vm/regexp.cc
@@ -5102,7 +5102,12 @@ static void CreateSpecializedFunction(Isolate* isolate,
   const intptr_t kParamCount = RegExpMacroAssembler::kParamCount;
 
   Function& fn = Function::Handle(isolate, Function::New(
-      Symbols::IrregExp(),
+      // Append the regexp pattern to the function name.
+      String::Handle(isolate, String::Concat(
+          String::Handle(isolate, String::Concat(
+              Symbols::Irregexp(),
+              Symbols::ColonSpace(), Heap::kOld)),
+          String::Handle(regexp.pattern()), Heap::kOld)),
       RawFunction::kIrregexpFunction,
       true,  // Static.
       false,  // Not const.