Revert "Compress memory usage. Imprive speed of finding exception handle..."

runtime/vm/stack_frame.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/stack_frame.h"
 
 #include "vm/assembler.h"
 #include "vm/deopt_instructions.h"
 #include "vm/isolate.h"
 #include "vm/object.h"
@@ skipping 144 matching lines @@
 
 
 bool StackFrame::FindExceptionHandler(uword* handler_pc,
                                       bool* needs_stacktrace,
                                       bool* is_catch_all) const {
   const Code& code = Code::Handle(LookupDartCode());
   if (code.IsNull()) {
     return false;  // Stub frames do not have exception handlers.
   }
 
-  ExceptionHandlers& handlers =
-      ExceptionHandlers::Handle(code.exception_handlers());
-  if (handlers.Length() == 0) {
-    return false;
-  }
   // Find pc descriptor for the current pc.
   const PcDescriptors& descriptors =
       PcDescriptors::Handle(code.pc_descriptors());
+  ExceptionHandlers& handlers = ExceptionHandlers::Handle();
   for (intptr_t i = 0; i < descriptors.Length(); i++) {
     if ((static_cast<uword>(descriptors.PC(i)) == pc()) &&
         (descriptors.TryIndex(i) != -1)) {
       const intptr_t try_index = descriptors.TryIndex(i);
       handlers = code.exception_handlers();
       *handler_pc = handlers.HandlerPC(try_index);
       *needs_stacktrace = handlers.NeedsStacktrace(try_index);
       *is_catch_all = handlers.HasCatchAll(try_index);
       return true;
     }
@@ skipping 206 matching lines @@
       pc_ = DeoptInstr::GetRetAddress(deopt_instr, object_table_, &func);
       code_ = func.unoptimized_code();
       function_ = func.raw();
       return;
     }
   }
   SetDone();
 }
 
 }  // namespace dart