[COMPILER REQUEST]: Add clang on macos

### Compiler name

LLVM Clang

### Compiler version

Homebrew clang version 19.1.7

### Compiler language

C++, C, LLVM IR, Assembly

### Compiler homepage

https://formulae.brew.sh/formula/llvm

### Motivation

There is some subtle differences between clang on macos and clang on linux, for example in clang on macos 64bit `size_t` and `uint64_t` are distinct types. Having clang on macos in godbolt enable testing code on this platform for people that don't have access to a macos machine.