x64 Emitter: Fix L bit in VEX prefix

src/common/x64/emitter.cpp

@@ -225,14 +225,14 @@ void OpArg::WriteVex(XEmitter* emit, X64Reg regOp1, X64Reg regOp2, int L, int pp
     // do we need any VEX fields that only appear in the three-byte form?
     if (X == 1 && B == 1 && W == 0 && mmmmm == 1)
     {
-        u8 RvvvvLpp = (R << 7) | (vvvv << 3) | (L << 1) | pp;
+        u8 RvvvvLpp = (R << 7) | (vvvv << 3) | (L << 2) | pp;
         emit->Write8(0xC5);
         emit->Write8(RvvvvLpp);
     }
     else
     {
         u8 RXBmmmmm = (R << 7) | (X << 6) | (B << 5) | mmmmm;
-        u8 WvvvvLpp = (W << 7) | (vvvv << 3) | (L << 1) | pp;
+        u8 WvvvvLpp = (W << 7) | (vvvv << 3) | (L << 2) | pp;
         emit->Write8(0xC4);
         emit->Write8(RXBmmmmm);
         emit->Write8(WvvvvLpp);