[PMC] Made Integer PMC increment and decrement promote to BigInt when necessary.
[PMC] Made Integer PMC increment and decrement promote to BigInt when
necessary.

This is going to be tricky to test, and I'm in an airport, so anyone who wants
cheap and easy karma should patch t/pmc/integer.t to gain effusive praise.

git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@32747 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

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