Fixes formatting of nested brace initializers.

We now format this correctly:
Status::Rep Status::global_reps[3] = {
  { kGlobalRef, OK_CODE, NULL, NULL, NULL },
  { kGlobalRef, CANCELLED_CODE, NULL, NULL, NULL },
  { kGlobalRef, UNKNOWN_CODE, NULL, NULL, NULL }
};

- fixed a bug where BreakBeforeClosingBrace would be set on the wrong
  state
- added penalties for breaking between = and {, and between { and any
  other non-{ token

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@172433 91177308-0d34-0410-b5e6-96231b3b80d8