Classes: Partial fix for constructor not calling super

src/x64/full-codegen-x64.cc

Index: src/x64/full-codegen-x64.cc
diff --git a/src/x64/full-codegen-x64.cc b/src/x64/full-codegen-x64.cc
index 25bfd340294e2f7aa9a84a6b336748ad9e4f4f35..af33c49e8afb8a31a0857a7706d9db06c39b37fa 100644
--- a/src/x64/full-codegen-x64.cc
+++ b/src/x64/full-codegen-x64.cc
@@ -408,7 +408,9 @@ void FullCodeGenerator::EmitReturnSequence() {
     Label check_exit_codesize;
     masm_->bind(&check_exit_codesize);
 #endif
-    CodeGenerator::RecordPositions(masm_, function()->end_position() - 1);
+    if (function()->end_position() != RelocInfo::kNoPosition) {
+      CodeGenerator::RecordPositions(masm_, function()->end_position() - 1);
+    }
     __ RecordJSReturn();
     // Do not use the leave instruction here because it is too short to
     // patch with the code required by the debugger.