changing frontend check back to what it was

Author: joaosaffran

clang/lib/Sema/SemaHLSL.cpp

@@ -1394,8 +1394,9 @@ bool SemaHLSL::handleRootSignatureElements(
           Diag(Loc, diag::err_hlsl_offset_overflow) << Offset << RangeBound;
         }
 
-        Offset = llvm::hlsl::rootsig::updateOngoingOffset(
-            Offset, Clause->NumDescriptors, Clause->Offset);
+        Offset = RangeBound == llvm::hlsl::rootsig::NumDescriptorsUnbounded
+                     ? uint32_t(RangeBound)
+                     : uint32_t(RangeBound + 1);
 
         // Compute the register bounds and track resource binding
         uint32_t LowerBound(Clause->Reg.Number);