Update V8 to r6101 as required by WebKit r74534

Change-Id: I7f84af8dd732f11898fd644b2c2b1538914cb78d
diff --git a/src/x64/disasm-x64.cc b/src/x64/disasm-x64.cc
index 4213912..7502d61 100644
--- a/src/x64/disasm-x64.cc
+++ b/src/x64/disasm-x64.cc
@@ -906,7 +906,9 @@
             case 0xE4: mnem = "ftst"; break;
             case 0xE8: mnem = "fld1"; break;
             case 0xEB: mnem = "fldpi"; break;
+            case 0xED: mnem = "fldln2"; break;
             case 0xEE: mnem = "fldz"; break;
+            case 0xF1: mnem = "fyl2x"; break;
             case 0xF5: mnem = "fprem1"; break;
             case 0xF7: mnem = "fincstp"; break;
             case 0xF8: mnem = "fprem"; break;