[mlir] CRunnerUtils: qualify UnrankedMemRefType to avoid collisions with mlir::UnrankedMemRefType

[ezhulenev]

Summary

When CRunnerUtils included together with MLIR IR headers, it can lead to compilation errors.

mlir/include/mlir/ExecutionEngine/CRunnerUtils.h

 public:
   explicit DynamicMemRefType(const StridedMemRefType<T, 0> &memRef)
       : rank(0), basePtr(memRef.basePtr), data(memRef.data),
         offset(memRef.offset), sizes(nullptr), strides(nullptr) {}
   template <int N>
   explicit DynamicMemRefType(const StridedMemRefType<T, N> &memRef)
       : rank(N), basePtr(memRef.basePtr), data(memRef.data),
         offset(memRef.offset), sizes(memRef.sizes), strides(memRef.strides) {}
-  explicit DynamicMemRefType(const UnrankedMemRefType<T> &memRef)
+  explicit DynamicMemRefType(const ::UnrankedMemRefType<T> &memRef)
       : rank(memRef.rank) {
     auto *desc = static_cast<StridedMemRefType<T, 1> *>(memRef.descriptor);
     basePtr = desc->basePtr;
     data = desc->data;
     offset = desc->offset;
     sizes = rank == 0 ? nullptr : desc->sizes;
     strides = sizes + rank;
   }
 
   int64_t rank;
   T *basePtr;
   T *data;
   int64_t offset;
   const int64_t *sizes;
   const int64_t *strides;
 };
 
 //===----------------------------------------------------------------------===//
 // Small runtime support library for memref.copy lowering during codegen.
 //===----------------------------------------------------------------------===//
 extern "C" MLIR_CRUNNERUTILS_EXPORT void
-memrefCopy(int64_t elemSize, UnrankedMemRefType<char> *src,
-           UnrankedMemRefType<char> *dst);
+memrefCopy(int64_t elemSize, ::UnrankedMemRefType<char> *src,
+           ::UnrankedMemRefType<char> *dst);
 
 //===----------------------------------------------------------------------===//
 // Small runtime support library for vector.print lowering during codegen.
 //===----------------------------------------------------------------------===//
 extern "C" MLIR_CRUNNERUTILS_EXPORT void printI64(int64_t i);
 extern "C" MLIR_CRUNNERUTILS_EXPORT void printU64(uint64_t u);
 extern "C" MLIR_CRUNNERUTILS_EXPORT void printF32(float f);
 extern "C" MLIR_CRUNNERUTILS_EXPORT void printF64(double d);