[clang] [analyzer] First batch of patches for the Juliet benchmark for taint improvements (PR #66074)

[Balazs Benics via cfe-commits]

steakhal wrote:

Sorry about the force push, but it was necessary to split off the `Fix taint sink rules for exec-like functions` commit from this PR.
 - I addressed the typos (I hope).
 - Using equality for checking against `stdint` instead of `contains`.
 - Fixed the build bots, because I forgot to define the `size_t` type in the tests.
 
 I'll re-run the measurement to ensure everything is all right.

https://github.com/llvm/llvm-project/pull/66074