[clang] [analyzer] Fix BuiltingFunctionChecker crash on large types (PR #174335)

[Balázs Benics via cfe-commits]

steakhal wrote:

> > In this patch, I simply sidestep this one by using BigInts
> 
> Is this type always available on all platforms?

I dont see any reason why it wouldnt work cross platform. This is to compute the mathematical result (that we discard once we figured out that wrapping happened or not to bind the correct return value) but the calculation itself still had wrapping semantics.


https://github.com/llvm/llvm-project/pull/174335