Update V8 to r6768 as required by WebKit r78450

Change-Id: Ib8868ff7147a76547a8d1d85f257ebe8546a3d3f
diff --git a/test/cctest/test-disasm-ia32.cc b/test/cctest/test-disasm-ia32.cc
index 30d708e..c995aa8 100644
--- a/test/cctest/test-disasm-ia32.cc
+++ b/test/cctest/test-disasm-ia32.cc
@@ -446,6 +446,14 @@
     }
   }
 
+  {
+    if (CpuFeatures::IsSupported(SSE4_1)) {
+      CpuFeatures::Scope scope(SSE4_1);
+      __ pextrd(Operand(eax), xmm0, 1);
+      __ pinsrd(xmm1, Operand(eax), 0);
+    }
+  }
+
   __ ret(0);
 
   CodeDesc desc;