[wasm] Make reported "column number" 1-based

src/isolate.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/isolate.h"
 
 #include <stdlib.h>
 
 #include <fstream>  // NOLINT(readability/streams)
 #include <sstream>
@@ skipping 603 matching lines @@
     if (!line_key_.is_null()) {
       JSObject::AddProperty(
           stack_frame, line_key_,
           isolate_->factory()->NewNumberFromInt(frame->function_index()), NONE);
     }
     // Encode the byte offset as column.
     if (!column_key_.is_null()) {
       Code* code = frame->LookupCode();
       int offset = static_cast<int>(frame->pc() - code->instruction_start());
       int position = code->SourcePosition(offset);
+      // Make position 1-based.
+      if (position >= 0) ++position;
       JSObject::AddProperty(stack_frame, column_key_,
                             isolate_->factory()->NewNumberFromInt(position),
                             NONE);
     }
 
     return stack_frame;
   }
 
  private:
   inline Factory* factory() { return isolate_->factory(); }
@@ skipping 2428 matching lines @@
   // Then check whether this scope intercepts.
   if ((flag & intercept_mask_)) {
     intercepted_flags_ |= flag;
     return true;
   }
   return false;
 }
 
 }  // namespace internal
 }  // namespace v8