[InstCombine] fold mul with incremented "shl 1" factor

X * ((1 << Z) + 1) --> (X << Z) + X

https://alive2.llvm.org/ce/z/P-7WK9

It's possible that we could do better with propagating
no-wrap, but this carries over the existing logic and
appears to be correct.

The naming differences on the existing folds are a result
of using getName() to set the final value via Builder.
That makes it easier to transfer no-wrap rather than the
gymnastics required from the raw create instruction APIs.