For PR1248: * Fix some indentation and comments in InsertRangeTest * Add an "IsSigned" parameter to AddWithOverflow and make it handle signed   additions. Also, APIntify this function so it works with any bitwidth. * For the icmp pred ([us]div %X, C1), C2 transforms, exit early if the   div instruction's RHS is zero. * Finally, for icmp pred (sdiv %X, C1), -C2, fix an off-by-one error. The   HiBound needs to be incremented in order to get the range test correct.
For PR1248:
* Fix some indentation and comments in InsertRangeTest
* Add an "IsSigned" parameter to AddWithOverflow and make it handle signed
  additions. Also, APIntify this function so it works with any bitwidth.
* For the icmp pred ([us]div %X, C1), C2 transforms, exit early if the
  div instruction's RHS is zero.
* Finally, for icmp pred (sdiv %X, C1), -C2, fix an off-by-one error. The
  HiBound needs to be incremented in order to get the range test correct.


git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@35247 91177308-0d34-0410-b5e6-96231b3b80d8

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