Issue Description:

Consider the following code:

do {
  // some code
}

// blank lines are irrelevant

while someCondition {
  // more code
}

The compiler will fail to accept this, because it thinks you're trying to write a 'do-while' loop, and produces a diagnostic suggesting a 'repeat-while' loop instead.

If we really do want a 'do' block which coincidentally happens to be followed by a 'while' loop, we need to separate them with a semicolon:

do {
 // some code
};
while someCondition {
 // more code
}

swift-format (0.50200.1, at its default settings) will remove this semicolon, breaking the code so it no longer compiles. It is important that this semicolon not be removed.