[TableGen] Handle ValueType in CodeGenDAGPatterns GetNumNodeResults
[TableGen] Handle ValueType in CodeGenDAGPatterns GetNumNodeResults

A ValueType in a pattern dag is a type cast, and GetNumNodeResults should
handle it (the type cast has only one result).

This comes up, for example, during the type checking of pattern fragments, for
example, AArch64's Neon_combine_2d fragment is:
  dag Operands = (ops node:$Rm, node:$Rn);
  dag Fragment = (v2f64 (concat_vectors (v1f64 node:$Rm), (v1f64 node:$Rn)));

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@198347 91177308-0d34-0410-b5e6-96231b3b80d8

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