[regexp] Avoid runtime call on OOB lastIndex values

src/code-stub-assembler.h

Index: src/code-stub-assembler.h
diff --git a/src/code-stub-assembler.h b/src/code-stub-assembler.h
index e430901212d79caa33e4747f5d5a1df5860aa69a..069323ce410f7f96041abf0685091b96113159dd 100644
--- a/src/code-stub-assembler.h
+++ b/src/code-stub-assembler.h
@@ -786,6 +786,7 @@ class V8_EXPORT_PRIVATE CodeStubAssembler : public compiler::CodeAssembler {
   // True iff |number| is either a Smi, or a HeapNumber whose value is not
   // within Smi range.
   Node* IsNumberNormalized(Node* number);
+  Node* IsNumberPositive(Node* number);
 
   // ElementsKind helpers:
   Node* IsFastElementsKind(Node* elements_kind);