clang-format: [JS] Hotfix for runtime issue with deeply nested JS code.

I have not succeeded in writing a proper test case for this yet and we
also need to solve the underlying fundamental problem of trying too
many combinations with nested blocks (basically this somewhat works
around our Dijkstra algorithm). Preventing this linebreak is good
anyways as usually the penalties never make us choose it (that's why I
can't create a test) and it also looks ugly.

Also cleaned up state comparison code that I discovered while hunting
this down.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@239398 91177308-0d34-0410-b5e6-96231b3b80d8