For PR1297:

For PR1297:
Document changes to bswap and bit counting intrinsics. bswap's name now
requires two types in the suffix per overloaded intrinsic naming rules.
The ctpop, cttz, and ctlz intrinsics were changed to always return i32.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35550 91177308-0d34-0410-b5e6-96231b3b80d8