[wasm] Translate locations to positions properly

src/wasm/wasm-objects.h

Index: src/wasm/wasm-objects.h
diff --git a/src/wasm/wasm-objects.h b/src/wasm/wasm-objects.h
index b9e2cd05aa4769b3105541b038970d12393c8032..19627fff00293101564c6bbf4c31d05af5bb3b0e 100644
--- a/src/wasm/wasm-objects.h
+++ b/src/wasm/wasm-objects.h
@@ -271,6 +271,11 @@ class WasmCompiledModule : public FixedArray {
   // Does not allocate, hence gc-safe.
   Vector<const uint8_t> GetRawFunctionName(uint32_t func_index);
 
+  // Return the byte offset of the function identified by the given index.
+  // The offset will be relative to the start of the module bytes.
+  // Returns -1 if the function index is invalid.
+  int GetFunctionOffset(uint32_t func_index) const;
+
  private:
   void InitId();