[mlir][sparse] fix build error.

[vzakhari]

Thank you. Would you please also fix issue in another file: https://reviews.llvm.org/D148565#inline-1447882?

nit: I think this is not Windows-specific

[Peiming]

fix more

[Peiming]

In D149874#4319396, @vzakhari wrote:

Thank you. Would you please also fix issue in another file: https://reviews.llvm.org/D148565#inline-1447882?

nit: I think this is not Windows-specific

Thanks, done!

mlir/lib/Dialect/SparseTensor/Transforms/CodegenEnv.h

public:
   DimLevelType dlt(TensorLoopId b) const {
     return latticeMerger.getDimLevelType(b);
   }
 
   //
   // LoopEmitter delegates.
   //
 
-  constexpr TensorLevel makeTensorLevel(TensorId t, Level l) const {
+  TensorLevel makeTensorLevel(TensorId t, Level l) const {
     // Make sure LoopEmitter, GenericOp, and Merger agree on the number of
     // tensors. Merger has one more synthetic tensor for loop invariants.
     assert(loopEmitter.getNumTensors() == linalgOp->getNumOperands() &&
            loopEmitter.getNumTensors() == latticeMerger.getNumTensors() - 1);
     return loopEmitter.makeTensorLevel(t, l);
   }
   std::pair<TensorId, Level> unpackTensorLevel(TensorLevel tl) const {
     return loopEmitter.unpackTensorLevel(tl);

mlir/lib/Dialect/SparseTensor/Transforms/LoopEmitter.h

public:
   Value getLoopIV(LoopOrd n) const {
     return n < getCurrentDepth() ? loopStack[n].iv : Value();
   }
 
   /// Gets the total number of tensors that loopEmitter is operating on.
   unsigned getNumTensors() const { return tensors.size(); }
 
   /// Compresses a TensorId and Level into a TensorLevel.
-  constexpr TensorLevel makeTensorLevel(TensorId t, Level l) const {
+  TensorLevel makeTensorLevel(TensorId t, Level l) const {
     return l * getNumTensors() + t;
   }
 
   /// De-compresses a TensorLevel back to a pair of TensorId and Level.
   std::pair<TensorId, Level> unpackTensorLevel(TensorLevel tidLvl) const {
     unsigned nt = getNumTensors();
     return std::make_pair(tidLvl % nt, tidLvl / nt);
   }