Fix usage of RAII to set cusparse/rocsparse stream (#2141)

Temporary objects like "A()" get destructed immediately.
For the object to have scope lifetime, it needs a name like "A a();".
This was causing cusparse/rocsparse spmv to always execute on the default stream,
causing incorrect timing in the spmv perf test.

sparse/tpls/KokkosSparse_spmv_bsrmatrix_tpl_spec_decl.hpp

@@ -372,7 +372,7 @@ void spmv_bsr_cusparse(const Kokkos::Cuda& exec, Handle* handle,
   cusparseHandle_t cusparseHandle =
       KokkosKernels::Impl::CusparseSingleton::singleton().cusparseHandle;
   /* Set cuSPARSE to use the given stream until this function exits */
-  KokkosSparse::Impl::TemporarySetCusparseStream(cusparseHandle, exec);
+  KokkosSparse::Impl::TemporarySetCusparseStream tscs(cusparseHandle, exec);
 
   /* Set the operation mode */
   cusparseOperation_t myCusparseOperation;
@@ -487,7 +487,7 @@ void spmv_mv_bsr_cusparse(const Kokkos::Cuda& exec, Handle* handle,
   cusparseHandle_t cusparseHandle =
       KokkosKernels::Impl::CusparseSingleton::singleton().cusparseHandle;
   /* Set cuSPARSE to use the given stream until this function exits */
-  KokkosSparse::Impl::TemporarySetCusparseStream(cusparseHandle, exec);
+  KokkosSparse::Impl::TemporarySetCusparseStream tscs(cusparseHandle, exec);
 
   /* Set the operation mode */
   cusparseOperation_t myCusparseOperation;

sparse/tpls/KokkosSparse_spmv_mv_tpl_spec_decl.hpp

@@ -111,7 +111,7 @@ void spmv_mv_cusparse(const Kokkos::Cuda &exec, Handle *handle,
   cusparseHandle_t cusparseHandle =
       KokkosKernels::Impl::CusparseSingleton::singleton().cusparseHandle;
   /* Set cuSPARSE to use the given stream until this function exits */
-  TemporarySetCusparseStream(cusparseHandle, exec);
+  TemporarySetCusparseStream tscs(cusparseHandle, exec);
 
   /* Check that cusparse can handle the types of the input Kokkos::CrsMatrix */
   const cusparseIndexType_t myCusparseOffsetType =

sparse/tpls/KokkosSparse_spmv_tpl_spec_decl.hpp

@@ -41,7 +41,7 @@ void spmv_cusparse(const Kokkos::Cuda& exec, Handle* handle, const char mode[],
   cusparseHandle_t cusparseHandle =
       KokkosKernels::Impl::CusparseSingleton::singleton().cusparseHandle;
   /* Set cuSPARSE to use the given stream until this function exits */
-  TemporarySetCusparseStream(cusparseHandle, exec);
+  TemporarySetCusparseStream tscs(cusparseHandle, exec);
 
   /* Set the operation mode */
   cusparseOperation_t myCusparseOperation;
@@ -389,7 +389,7 @@ void spmv_rocsparse(const Kokkos::HIP& exec, Handle* handle, const char mode[],
   rocsparse_handle rocsparseHandle =
       KokkosKernels::Impl::RocsparseSingleton::singleton().rocsparseHandle;
   /* Set rocsparse to use the given stream until this function exits */
-  TemporarySetRocsparseStream(rocsparseHandle, exec);
+  TemporarySetRocsparseStream tsrs(rocsparseHandle, exec);
 
   /* Set the operation mode */
   rocsparse_operation myRocsparseOperation = mode_kk_to_rocsparse(mode);