[vm] Try to symbolize Dart frames on crash or assertion failure when there is an exit frame.

Remove disabled/broken symbolization based on heap iteration.

Bug: https://bugs.fuchsia.dev/p/fuchsia/issues/detail?id=41154
Change-Id: I5e6644e6ef72177cefec920fbe653000a4868f5d
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/124826
Reviewed-by: Alexander Markov <alexmarkov@google.com>
Commit-Queue: Ryan Macnak <rmacnak@google.com>

runtime/vm/stack_frame.h

@@ -130,6 +130,8 @@ class StackFrame : public ValueObject {
   // Returns token_pos of the pc(), or -1 if none exists.
   TokenPosition GetTokenPos() const;
 
+  static void DumpCurrentTrace();
+
  protected:
   explicit StackFrame(Thread* thread)
       : fp_(0), sp_(0), pc_(0), thread_(thread), is_interpreted_(false) {}