[nfc] Update MaybeReorderThread description (must not be 'undef' as said before)

Author: simoll

include/dxc/DXIL/DxilConstants.h

@@ -487,8 +487,7 @@ inline bool IsFeedbackTexture(DXIL::ResourceKind ResourceKind) {
 // Enumeration for operations specified by DXIL
 enum class OpCode : unsigned {
   //
-  MaybeReorderThread = 268, // Reorders the current thread. Optionally accepts a
-                            // HitObject arg, or undef
+  MaybeReorderThread = 268, // Reorders the current thread
   Reserved0 = 226,          // Reserved
   Reserved1 = 227,          // Reserved
   Reserved10 = 236,         // Reserved

include/dxc/DXIL/DxilInstructions.h

@@ -8987,8 +8987,7 @@ struct DxilInst_HitObject_MakeNop {
   bool requiresUniformInputs() const { return false; }
 };
 
-/// This instruction Reorders the current thread. Optionally accepts a HitObject
-/// arg, or undef
+/// This instruction Reorders the current thread
 struct DxilInst_MaybeReorderThread {
   llvm::Instruction *Instr;
   // Construction and identification

utils/hct/hctdb.py

@@ -5833,7 +5833,7 @@ def UFI(name, **mappings):
             "MaybeReorderThread",
             next_op_idx,
             "MaybeReorderThread",
-            "Reorders the current thread. Optionally accepts a HitObject arg, or undef",
+            "Reorders the current thread",
             "v",
             "",
             [