This patch adjusts the intrinsics definition of
llvm.matrix.column.major.load and llvm.matrix.column.major.store to
allow overloading the type of the stride. The bitwidth of the stride is
used to perform the offset computation.
This fixes a crash when using builtin_matrix_column_major_load or
builtin_matrix_column_major_store on 32 bit platforms. The stride argument
of the builtins are defined as size_t, which is 32 bits wide on 32 bit
Note that we still perform offset computations with 64 bit width on 32
bit platforms for accesses that do not take a user-specified stride.
This can be fixed separately.