Remove support for branch hints from the IA32 and X64 assembler.

src/ia32/macro-assembler-ia32.h

Index: src/ia32/macro-assembler-ia32.h
===================================================================
--- src/ia32/macro-assembler-ia32.h	(revision 7864)
+++ src/ia32/macro-assembler-ia32.h	(working copy)
@@ -265,12 +265,12 @@
   // Jump the register contains a smi.
   inline void JumpIfSmi(Register value, Label* smi_label) {
     test(value, Immediate(kSmiTagMask));
-    j(zero, smi_label, not_taken);
+    j(zero, smi_label);
   }
   // Jump if register contain a non-smi.
   inline void JumpIfNotSmi(Register value, Label* not_smi_label) {
     test(value, Immediate(kSmiTagMask));
-    j(not_zero, not_smi_label, not_taken);
+    j(not_zero, not_smi_label);
   }
 
   // Assumes input is a heap object.