Commits on May 14, 2017

1. Removes unnecessary shift count masking …

   The C# compiler translates code like `x << y` to `x << (y & 31)` because the behavior of IL shift operations is unspecified if the shift count is greater than or equal to the bit width of the shifted value. However, x86/x64 shift instructions do mask the shift count so `& 31` is redundant.
   
   It's also possible that developers also mask the shift count, not knowing that the C# language specification guarantees masking. In that case we end up with 2 `and x, 31` instructions.

   

   mikedn committed May 14, 2017
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