Add PXCF configuration parser and fix macOS LLVM 19 build

Author: ProgrammerKR

src/compiler/backend_llvm.cpp

@@ -2,6 +2,7 @@
 #include <llvm/IR/LLVMContext.h>
 #include <llvm/IR/Module.h>
 #include <llvm/IR/Verifier.h>
+#include <llvm/IR/Intrinsics.h>
 #include <llvm/Support/raw_ostream.h>
 #include <vector>
 #include <map>