`nargs="?"` accept 0 or 1 argument, but `nargs="*"` accepts 0 or any number of arguments, which is the intended behavior of the tool
Test plan: Run `python tools/build_with_debinfo.py aten/src/ATen/native/cpu/BlasKernel.cpp aten/src/ATen/native/BlasKernel.cpp` and observe that it generates torch_cpu with those two files containing debug information
Pull Request resolved: https://github.com/pytorch/pytorch/pull/120088
Approved by: https://github.com/Skylion007
Turned command sequence mentioned in https://dev-discuss.pytorch.org/t/how-to-get-a-fast-debug-build/1597 and in various discussions into a tool that I use almost daily to debug crashes or correctness issues in the codebase
Essentially it allows one to turn this:
```
Process 87729 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1
frame #0: 0x00000001023d55a8 libtorch_python.dylib`at::indexing::impl::applySelect(at::Tensor const&, long long, c10::SymInt, long long, c10::Device const&, std::__1::optional<c10::ArrayRef<c10::SymInt>> const&)
libtorch_python.dylib`at::indexing::impl::applySelect:
-> 0x1023d55a8 <+0>: sub sp, sp, #0xd0
0x1023d55ac <+4>: stp x24, x23, [sp, #0x90]
0x1023d55b0 <+8>: stp x22, x21, [sp, #0xa0]
0x1023d55b4 <+12>: stp x20, x19, [sp, #0xb0]
```
into this
```
Process 87741 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1
frame #0: 0x00000001024e2628 libtorch_python.dylib`at::indexing::impl::applySelect(self=0x00000001004ee8a8, dim=0, index=(data_ = 3), real_dim=0, (null)=0x000000016fdfe535, self_sizes= Has Value=true ) at TensorIndexing.h:239:7
236 const at::Device& /*self_device*/,
237 const c10::optional<SymIntArrayRef>& self_sizes) {
238 // See NOTE [nested tensor size for indexing]
-> 239 if (self_sizes.has_value()) {
240 auto maybe_index = index.maybe_as_int();
241 if (maybe_index.has_value()) {
242 TORCH_CHECK_INDEX(
```
while retaining good performance for the rest of the codebase
Pull Request resolved: https://github.com/pytorch/pytorch/pull/116521
Approved by: https://github.com/atalman
