clang-format: With ColumnLimit=0, keep short array literals on a line.

Before:
    NSArray* a = [[NSArray alloc] initWithArray:@[
                                                   @"a"
                                                ]
                                      copyItems:YES];

After:
    NSArray* a = [[NSArray alloc] initWithArray:@[ @"a" ]
                                      copyItems:YES];

This fixed llvm.org/PR19080.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@206161 91177308-0d34-0410-b5e6-96231b3b80d8