Duncan P. N. Exon Smith c2c5e48ad5 IR: Allow MDSubrange to have 'count: -1' ...

It turns out that `count: -1` is a special value indicating an empty
array, such as `Values` in:

    struct T {
      unsigned Count;
      int Values[];
    };

Handle it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229769 91177308-0d34-0410-b5e6-96231b3b80d8

2015-02-18 23:17:51 +00:00

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