[lang] Vector size not checked before scalarize

[bobcao3]

This following code:

import taichi as ti

ti.init()

f = ti.Vector.field(4, dtype = ti.f32, shape = ())

@ti.kernel
def update_f():
    f[None] = ti.Vector([1, 2, 3])

update_f()
print(f)

produces this error:

[Taichi] version 1.5.0, llvm 15.0.1, commit ae61418d, win, python 3.9.12
[I 02/27/23 14:08:59.905 27420] [shell.py:_shell_pop_print@23] Graphical python shell detected, using wrapped sys.stdout
c:\users\cheng cao\source\repos\taichi\python\taichi\types\ndarray_type.py:91: DeprecationWarning: The element_dim and element_shape arguments for ndarray will be deprecated in v1.5.0, use matrix dtype instead.
  warnings.warn(
[Taichi] Starting on arch=x64
[E 02/27/23 14:09:00.348 27420] [scalarize.cpp:taichi::lang::Scalarize::scalarize_store_stmt@51] Assertion failure: dest_tensor_type->get_shape() == val_tensor_type->get_shape()


Traceback (most recent call last):
  File "C:\Users\Cheng Cao\test_vec.py", line 11, in <module>
    update_f()
  File "c:\users\cheng cao\source\repos\taichi\python\taichi\lang\kernel_impl.py", line 1004, in wrapped
    return primal(*args, **kwargs)
  File "c:\users\cheng cao\source\repos\taichi\python\taichi\lang\shell.py", line 27, in new_call
    ret = old_call(*args, **kwargs)
  File "c:\users\cheng cao\source\repos\taichi\python\taichi\lang\kernel_impl.py", line 931, in __call__
    return self.runtime.compiled_functions[key](*args)
  File "c:\users\cheng cao\source\repos\taichi\python\taichi\lang\kernel_impl.py", line 835, in func__
    raise e from None
  File "c:\users\cheng cao\source\repos\taichi\python\taichi\lang\kernel_impl.py", line 832, in func__
    t_kernel(launch_ctx)
RuntimeError: [scalarize.cpp:taichi::lang::Scalarize::scalarize_store_stmt@51] Assertion failure: dest_tensor_type->get_shape() == val_tensor_type->get_shape()

1. This should be a compile error
2. This error should be caught in type check