Classes: Partial fix for constructor not calling super

src/x87/full-codegen-x87.cc

Index: src/x87/full-codegen-x87.cc
diff --git a/src/x87/full-codegen-x87.cc b/src/x87/full-codegen-x87.cc
index 729655d80a1e65e6895991028071fddb8a67f787..c0aa9b25b87f8fd9e1fe0259028461938e409e2a 100644
--- a/src/x87/full-codegen-x87.cc
+++ b/src/x87/full-codegen-x87.cc
@@ -402,7 +402,9 @@ void FullCodeGenerator::EmitReturnSequence() {
     Label check_exit_codesize;
     masm_->bind(&check_exit_codesize);
 #endif
-    SetSourcePosition(function()->end_position() - 1);
+    if (function()->end_position() != RelocInfo::kNoPosition) {
+      SetSourcePosition(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.