Inconsistent formatting (first pass, second pass results in a different output).

This class:
```
class Xyz {
void foo() {
int i = 0;
switch (i) {
case 18:
{ /* Break so we don't hit fall-through warning: */ break;/* ignore STRING */
}
}}}
```
results in a different output when you run gjf multiple times:
```
$ java -jar google-java-format-1.27.0-all-deps.jar src.java > 1.java
$ java -jar google-java-format-1.27.0-all-deps.jar 1.java > 2.java
$ diff 1.java 2.java
7c7
< /* Break so we don't hit fall-through warning: */
---
> /* Break so we don't hit fall-through warning: */
```