[string] Migrate String.prototype.{split,replace} to TF

src/runtime/runtime-strings.cc

Index: src/runtime/runtime-strings.cc
diff --git a/src/runtime/runtime-strings.cc b/src/runtime/runtime-strings.cc
index a126e8cd6379a92f766636036da5e9dcfc2903d6..d51d8bafa13d9c035f3efcfe75db65d0167694d8 100644
--- a/src/runtime/runtime-strings.cc
+++ b/src/runtime/runtime-strings.cc
@@ -13,6 +13,44 @@
 namespace v8 {
 namespace internal {
 
+RUNTIME_FUNCTION(Runtime_GetSubstitution) {
+  HandleScope scope(isolate);
+  DCHECK_EQ(4, args.length());
+  CONVERT_ARG_HANDLE_CHECKED(String, matched, 0);
+  CONVERT_ARG_HANDLE_CHECKED(String, subject, 1);
+  CONVERT_SMI_ARG_CHECKED(position, 2);
+  CONVERT_ARG_HANDLE_CHECKED(String, replacement, 3);
+
+  // A simple match without captures.
+  class SimpleMatch : public String::Match {
+   public:
+    SimpleMatch(Handle<String> match, Handle<String> prefix,
+                Handle<String> suffix)
+        : match_(match), prefix_(prefix), suffix_(suffix) {}
+
+    Handle<String> GetMatch() override { return match_; }
+    MaybeHandle<String> GetCapture(int i, bool* capture_exists) override {
+      *capture_exists = false;
+      return match_;  // Return arbitrary string handle.
+    }
+    Handle<String> GetPrefix() override { return prefix_; }
+    Handle<String> GetSuffix() override { return suffix_; }
+    int CaptureCount() override { return 0; }
+
+   private:
+    Handle<String> match_, prefix_, suffix_;
+  };
+
+  Handle<String> prefix =
+      isolate->factory()->NewSubString(subject, 0, position);
+  Handle<String> suffix = isolate->factory()->NewSubString(
+      subject, position + matched->length(), subject->length());
+  SimpleMatch match(matched, prefix, suffix);
+
+  RETURN_RESULT_OR_FAILURE(
+      isolate, String::GetSubstitution(isolate, &match, replacement));
+}
+
 // This may return an empty MaybeHandle if an exception is thrown or
 // we abort due to reaching the recursion limit.
 MaybeHandle<String> StringReplaceOneCharWithString(