clang-scan-deps crashes when input file does not exist

[namniav]

Simple repro:

clang-scan-deps --format=p1689 -- `which clang++` --std=c++20 this-file-does-not-exist.cpp

Result:

error: no such file or directory: 'this-file-does-not-exist.cpp'
error: no input files
PLEASE submit a bug report to https://github.com/Homebrew/homebrew-core/issues and include the crash backtrace.
Stack dump:
0.	Program arguments: clang-scan-deps --format=p1689 -- /opt/homebrew/opt/llvm/bin/clang++ --std=c++20 this-file-does-not-exist.cpp
Stack dump without symbol names (ensure you have llvm-symbolizer in your PATH or set the environment var `LLVM_SYMBOLIZER_PATH` to point to it):
0  libLLVM.dylib            0x0000000114052494 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) + 56
1  libLLVM.dylib            0x0000000117e9d550 SignalHandler(int) + 304
2  libsystem_platform.dylib 0x000000019880d4c4 _sigtramp + 56
3  clang-scan-deps          0x0000000102c4aae4 main + 5448
4  dyld                     0x0000000102df1088 start + 516
[1]    25079 segmentation fault  clang-scan-deps --format=p1689 -- /opt/homebrew/opt/llvm/bin/clang++ 

Version info:

$ clang-scan-deps --version
Homebrew LLVM version 16.0.6
  Optimized build.

I can reproduce this with non-Homebrew builds, so I report here instead of to Homebrew.