Revert "[kernel] Stream everything. Replace .kernel_function with .kernel_offset"

runtime/vm/kernel.h

 // Copyright (c) 2016, 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.
 
 #ifndef RUNTIME_VM_KERNEL_H_
 #define RUNTIME_VM_KERNEL_H_
 
 #if !defined(DART_PRECOMPILED_RUNTIME)
 #include "platform/assert.h"
 #include "vm/allocation.h"
@@ skipping 411 matching lines @@
 
 
 class TreeNode : public Node {
  public:
   virtual ~TreeNode();
 
   DEFINE_CASTING_OPERATIONS(TreeNode);
 
   virtual void AcceptVisitor(Visitor* visitor);
   virtual void AcceptTreeVisitor(TreeVisitor* visitor) = 0;
-  intptr_t kernel_offset() const {
-    ASSERT(kernel_offset_ > 0);
-    return kernel_offset_;
-  }
+  intptr_t kernel_offset() const { return kernel_offset_; }
   bool can_stream() { return can_stream_; }
 
  protected:
   TreeNode() : kernel_offset_(-1), can_stream_(true) {}
 
   // Offset for this node in the kernel-binary. If this node has a tag the
   // offset includes the tag. Can be -1 to indicate "unknown" or invalid offset.
   intptr_t kernel_offset_;
 
   bool can_stream_;
@@ skipping 3008 matching lines @@
 }  // namespace kernel
 
 kernel::Program* ReadPrecompiledKernelFromBuffer(const uint8_t* buffer,
                                                  intptr_t buffer_length);
 
 
 }  // namespace dart
 
 #endif  // !defined(DART_PRECOMPILED_RUNTIME)
 #endif  // RUNTIME_VM_KERNEL_H_