Pretty print labels and case stmts better. This leads to output like this:

void foo() {
abc:
def:
hij:
case 1:
case 1:
  goto abc
baz:
  goto def
}

instead of:

void foo() {
  abc:
    def:
      hij:
        case 1:
          case 1:
            goto abc
  baz:
    goto def
}

llvm-svn: 39468