[X86] Add some missing blsr patterns

The add+and sequence followed by a branch can
happen e.g. when looping over the set bits of an integer:

```
while (x != 0) {
   func(x & ~x);
   x &= x - 1;
}
```

Reviewed By: ctopper

Differential Revision: https://reviews.llvm.org/D57296

llvm-svn: 352306