Three or more calls with cleanups fail

[smeenai]

As shown in https://godbolt.org/z/hG7ch1db3, the following code:

struct has_cleanup {
  ~has_cleanup();
};
void may_throw();
void func() {
  has_cleanup cleanup;
  may_throw();
  may_throw();
  may_throw();
}

Results in an error:

loc("<source>":5:6): error: empty block: expect at least a terminator

What's interesting is that it works fine with two calls to may_throw; it's the third call (and any subsequent ones) that cause the issue.

https://godbolt.org/z/T3veaWWfv shows the emitted CIR that fails verification, and it seems like the middle call is failing to get the proper cleanup and catch blocks.