If a rethrow is encountered in the catch block, then its handler must be marked that it needs stack…

runtime/vm/intermediate_language.h

Index: runtime/vm/intermediate_language.h
===================================================================
--- runtime/vm/intermediate_language.h	(revision 26962)
+++ runtime/vm/intermediate_language.h	(working copy)
@@ -1986,13 +1986,17 @@
 
 class ReThrowInstr : public TemplateInstruction<0> {
  public:
-  explicit ReThrowInstr(intptr_t token_pos) : token_pos_(token_pos) { }
+  // 'catch_try_index' can be CatchClauseNode::kInvalidTryIndex if the
+  // rethrow has been artifically generated by the parser.
+  ReThrowInstr(intptr_t token_pos, intptr_t catch_try_index)
+      : token_pos_(token_pos), catch_try_index_(catch_try_index) {}
 
   DECLARE_INSTRUCTION(ReThrow)
 
   virtual intptr_t ArgumentCount() const { return 2; }
 
   intptr_t token_pos() const { return token_pos_; }
+  intptr_t catch_try_index() const { return catch_try_index_; }
 
   virtual bool CanDeoptimize() const { return true; }
 
@@ -2002,6 +2006,7 @@
 
  private:
   const intptr_t token_pos_;
+  const intptr_t catch_try_index_;
 
   DISALLOW_COPY_AND_ASSIGN(ReThrowInstr);
 };