Make line-starts 32-bits TypedData instead of Array of smis.

runtime/vm/raw_object.h

 // 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.
 
 #ifndef RUNTIME_VM_RAW_OBJECT_H_
 #define RUNTIME_VM_RAW_OBJECT_H_
 
 #include "platform/assert.h"
 #include "vm/atomic.h"
 #include "vm/exceptions.h"
@@ skipping 1043 matching lines @@
     kKernelTag,
   };
 
  private:
   RAW_HEAP_OBJECT_IMPLEMENTATION(Script);
 
   RawObject** from() { return reinterpret_cast<RawObject**>(&ptr()->url_); }
   RawString* url_;
   RawString* resolved_url_;
   RawArray* compile_time_constants_;
-  RawArray* line_starts_;
+  RawTypedData* line_starts_;
   RawArray* debug_positions_;
   RawArray* yield_positions_;
   RawTypedData* kernel_string_offsets_;
   RawTypedData* kernel_string_data_;
   RawTypedData* kernel_canonical_names_;
   RawTokenStream* tokens_;
   RawString* source_;
   RawObject** to() { return reinterpret_cast<RawObject**>(&ptr()->source_); }
   RawObject** to_snapshot(Snapshot::Kind kind) {
     switch (kind) {
@@ skipping 1364 matching lines @@
   COMPILE_ASSERT(kExternalTypedDataInt8ArrayCid ==
                  kTypedDataInt8ArrayViewCid + 15);
   COMPILE_ASSERT(kByteBufferCid == kExternalTypedDataInt8ArrayCid + 14);
   COMPILE_ASSERT(kNullCid == kByteBufferCid + 1);
   return (kNullCid - kTypedDataInt8ArrayCid);
 }
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_RAW_OBJECT_H_