Justin Lebar cbba3c4aef Fix isShiftedInt and isShiftedUint for widths > 32. ...

Summary:
Previously we were doing 1 << S.  "1" is an int, so this doesn't work
when S >= 32.

This patch also adds some static_asserts to these functions to ensure
that we don't hit UB by shifting left too much.

Reviewers: rnk

Subscribers: llvm-commits, dylanmckay

Differential Revision: https://reviews.llvm.org/D22441

llvm-svn: 275719

2016-07-17 18:19:21 +00:00

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