Hook ByteArrayViewLoad operations into polymorphic inliner

runtime/lib/typed_data.dart

Index: runtime/lib/typed_data.dart
diff --git a/runtime/lib/typed_data.dart b/runtime/lib/typed_data.dart
index 9e2a114e097ba57f770181caeb47b2946c65a1e7..62ca19787daec82bac5e49ae4281ea2b7128b40e 100644
--- a/runtime/lib/typed_data.dart
+++ b/runtime/lib/typed_data.dart
@@ -695,6 +695,8 @@ class _Uint8Array extends _TypedList implements Uint8List {
     return _new(length);
   }
 
+  int _getUint8(int offsetInBytes) native "TypedData_GetUint8";

[Cutch, 2013/10/07 23:49:50]

I have to override _getUint8 in _Uint8Array and _ExternalUint8Array (see below)
so that the IC data has more than one target. Without this change the optimizer
and polymorphic inliner think the call site has a single target (correctly) but
the target itself determines the class id and does the right thing.

The problem is that we have ~18 TypedArray classes and would need 18*18 methods
(and add them all to the method recognizer— and that's just counting the load
operations) to support a load of any type from a view of any type. We could
support few but common configurations.

+
   static _Uint8Array _new(int length) native "TypedData_Uint8Array_new";
 }
 
@@ -1405,6 +1407,8 @@ class _ExternalUint8Array extends _TypedList implements Uint8List {
     return new Uint8List(length);
   }
 
+  int _getUint8(int offsetInBytes) native "TypedData_GetUint8";
+
   static _ExternalUint8Array _new(int length) native
       "ExternalTypedData_Uint8Array_new";
 }