Revert "OpcodeDispatcher: Use plain Lshl for flags"

This logic is unused since 8adfaa9aa ("OpcodeDispatcher: Use SelectCC for x87"),
which addressed the underlying issue.

This reverts commit df3833edbe.

FEXCore/Source/Interface/Core/OpcodeDispatcher/Flags.cpp

@@ -141,7 +141,6 @@ OrderedNode *OpDispatchBuilder::GetPackedRFLAG(uint32_t FlagsMask) {
   CalculateDeferredFlags();
 
   OrderedNode *Original = _Constant(0);
-  bool Nonzero = false;
 
   // SF/ZF and N/Z are together on both arm64 and x86_64, so we special case that.
   bool GetNZ = (FlagsMask & (1 << FEXCore::X86State::RFLAG_SF_LOC)) &&
@@ -151,7 +150,6 @@ OrderedNode *OpDispatchBuilder::GetPackedRFLAG(uint32_t FlagsMask) {
   if (FlagsMask & (1 << FEXCore::X86State::RFLAG_CF_LOC)) {
     static_assert(FEXCore::X86State::RFLAG_CF_LOC == 0);
     Original = GetRFLAG(FEXCore::X86State::RFLAG_CF_LOC);
-    Nonzero = true;
   }
 
   for (size_t i = 0; i < FlagOffsets.size(); ++i) {
@@ -177,12 +175,7 @@ OrderedNode *OpDispatchBuilder::GetPackedRFLAG(uint32_t FlagsMask) {
     else
       Flag = GetRFLAG(FlagOffset);
 
-    if (Nonzero)
-      Original = _Orlshl(OpSize::i64Bit, Original, Flag, FlagOffset);
-    else
-      Original = _Lshl(OpSize::i64Bit, Flag, _Constant(FlagOffset));
-
-    Nonzero = true;
+    Original = _Orlshl(OpSize::i64Bit, Original, Flag, FlagOffset);
   }
 
   // OR in the SF/ZF flags at the end, allowing the lshr to fold with the OR