[clang][bytecode] compilation hangs when possible infinite loop exists

[k-arrows]

Reproducer:
https://godbolt.org/z/9WfeabYTx

constexpr int foo(int p) {
  int t = 0;
  while (1)
    ;
  return t;
}

static_assert (foo (1) == 0, "");

When the above program is compiled with option -fexperimental-new-constant-interpreter enabled, it hangs. When the option is disabled, a compilation error is correctly reported as expected.

[shafik]

CC @tbaederr this looks like it goes to clang-16 but not clear to me if this is a regression or we just are hitting something differently. It felt a bit slow before 16 as well.

[tbaederr]

It's just the inifinite loop detection being unimplemented.