[turbofan] Insert appropriate conversions for typed array stores.

test/mjsunit/mjsunit.status

 # Copyright 2012 the V8 project authors. All rights reserved.
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 #     * Redistributions of source code must retain the above copyright
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@@ skipping 36 matching lines @@
 
   # This test non-deterministically runs out of memory on Windows ia32.
   'regress/regress-crbug-160010': [SKIP],
 
   # Issue 3389: deopt_every_n_garbage_collections is unsafe
   'regress/regress-2653': [SKIP],
 
   ##############################################################################
   # TurboFan compiler failures.
 
-  # TODO(jarin) We should truncate instead of change for some stores.
-  'compiler/truncating-store': [PASS, FAIL],
-
   # TODO(mstarzinger): An arguments object materialized in the prologue can't
   # be accessed indirectly. Either we drop that requirement or wait for support
   # from the deoptimizer to do that.
   'arguments-indirect': [PASS, NO_VARIANTS],
 
   # TODO(verwaest): Some tests are over-restrictive about object layout.
   'array-constructor-feedback': [PASS, NO_VARIANTS],
   'array-feedback': [PASS, NO_VARIANTS],
   'compare-known-objects-slow': [PASS, NO_VARIANTS],
   'elements-kind': [PASS, NO_VARIANTS],
@@ skipping 509 matching lines @@
   'never-optimize': [SKIP],
   'regress/regress-2185-2': [SKIP],
   'harmony/object-observe': [SKIP],
   'readonly': [SKIP],
   'array-feedback': [SKIP],
 
   # Deopt every n garbage collections collides with deopt every n times.
   'regress/regress-2653': [SKIP],
 }],  # 'deopt_fuzzer == True'
 ]