Reapply "[Clang][Interp] __builtin_os_log_format_buffer_size should be an unevaluated builtin (llvm#99895)"

This reverts commit 5f05d5e.

Reapply the original commit without the test. The memory leak is caused
by a well known problem in the new constant interpreter.

Author: tbaederr

clang/lib/AST/Interp/ByteCodeEmitter.cpp

@@ -27,7 +27,8 @@ using namespace clang::interp;
 /// Similar information is available via ASTContext::BuiltinInfo,
 /// but that is not correct for our use cases.
 static bool isUnevaluatedBuiltin(unsigned BuiltinID) {
-  return BuiltinID == Builtin::BI__builtin_classify_type;
+  return BuiltinID == Builtin::BI__builtin_classify_type ||
+         BuiltinID == Builtin::BI__builtin_os_log_format_buffer_size;
 }
 
 Function *ByteCodeEmitter::compileFunc(const FunctionDecl *FuncDecl) {