Errors when handling `Xclang` options in compile_commands.json

Infer version: v1.2.0-8a743a22fa
OS: Ubuntu 22.04.5 LTS.

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In some cases, options need to be passed with "-Xclang" or "-mllvm", and Infer seems to have problems when handling such options in compilation databases.

In my particular case, the compile command contains `-Xclang -mllvm -Xclang -instcombine-lower-dbg-declare=0`. Here is a simple `hello.cpp` (the content is not important, it is here just to show the workflow) :

```c++
#include

using namespace std;

int main(void) {
cout<<"Hello, World!"<