A64: Remove temporary sxtw instructions

BUG=v8:3149
LOG=
R=ulan@chromium.org

Review URL: https://codereview.chromium.org/199183002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19906 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/a64/macro-assembler-a64.cc

@@ -2824,10 +2824,6 @@ void MacroAssembler::TruncateDoubleToI(Register result,
   Pop(lr);
 
   Bind(&done);
-
-  // TODO(rmcilroy): Remove this Sxtw once the following bug is fixed:
-  // https://code.google.com/p/v8/issues/detail?id=3149
-  Sxtw(result, result.W());
 }
 
 
@@ -2854,10 +2850,6 @@ void MacroAssembler::TruncateHeapNumberToI(Register result,
   Pop(lr);
 
   Bind(&done);
-
-  // TODO(rmcilroy): Remove this Sxtw once the following bug is fixed:
-  // https://code.google.com/p/v8/issues/detail?id=3149
-  Sxtw(result, result.W());
 }