One more fix to async machinery (rethrow in finally, issue 22595).

runtime/vm/ast.h

Index: runtime/vm/ast.h
===================================================================
--- runtime/vm/ast.h	(revision 44187)
+++ runtime/vm/ast.h	(working copy)
@@ -1785,6 +1785,8 @@
                   const LocalVariable* context_var,
                   const LocalVariable* exception_var,
                   const LocalVariable* stacktrace_var,
+                  const LocalVariable* rethrow_exception_var,
+                  const LocalVariable* rethrow_stacktrace_var,
                   intptr_t catch_handler_index,
                   bool needs_stacktrace)
       : AstNode(token_pos),
@@ -1793,6 +1795,8 @@
         context_var_(*context_var),
         exception_var_(*exception_var),
         stacktrace_var_(*stacktrace_var),
+        rethrow_exception_var_(*rethrow_exception_var),
+        rethrow_stacktrace_var_(*rethrow_stacktrace_var),
         catch_handler_index_(catch_handler_index),
         needs_stacktrace_(needs_stacktrace) {
     ASSERT(catch_block_ != NULL);
@@ -1806,6 +1810,12 @@
   const LocalVariable& context_var() const { return context_var_; }
   const LocalVariable& exception_var() const { return exception_var_; }
   const LocalVariable& stacktrace_var() const { return stacktrace_var_; }
+  const LocalVariable& rethrow_exception_var() const {
+      return rethrow_exception_var_;
+  }
+  const LocalVariable& rethrow_stacktrace_var() const {
+      return rethrow_stacktrace_var_;
+  }
   intptr_t catch_handler_index() const { return catch_handler_index_; }
   bool needs_stacktrace() const { return needs_stacktrace_; }
 
@@ -1821,6 +1831,8 @@
   const LocalVariable& context_var_;
   const LocalVariable& exception_var_;
   const LocalVariable& stacktrace_var_;
+  const LocalVariable& rethrow_exception_var_;
+  const LocalVariable& rethrow_stacktrace_var_;
   const intptr_t catch_handler_index_;
   const bool needs_stacktrace_;