[wasm] prototype for breakpoint support.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index cdc1c993ff5b7f536302fea0a68f4209f7c63884..ba4fa7f1ffe4f429121b83f6df7a2293c570dc25 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -4874,7 +4874,8 @@ class Code: public HeapObject {
   V(REGEXP)                 \
   V(WASM_FUNCTION)          \
   V(WASM_TO_JS_FUNCTION)    \
-  V(JS_TO_WASM_FUNCTION)
+  V(JS_TO_WASM_FUNCTION)    \
+  V(WASM_TO_INTERPRETER)
 
 #define IC_KIND_LIST(V) \
   V(LOAD_IC)            \
@@ -10617,6 +10618,8 @@ class ObjectTemplateInfo: public TemplateInfo {
 class DebugInfo: public Struct {
  public:
   // The shared function info for the source being debugged.
+  // Some debug info does not have an shared function info, e.g. for wasm, so
+  // check has_shared() before calling shared().
   DECL_ACCESSORS(shared, SharedFunctionInfo)
   // Code object for the patched code. This code object is the code object
   // currently active for the function.
@@ -10624,6 +10627,8 @@ class DebugInfo: public Struct {
   // Fixed array holding status information for each active break point.
   DECL_ACCESSORS(break_points, FixedArray)
 
+  // Check whether a shared function info is available for this debug info.
+  inline bool has_shared() const;
   // Check if there is a break point at a code offset.
   bool HasBreakPoint(int code_offset);
   // Get the break point info object for a code offset.