[SelectionDAG] Don't inspect !range metadata for extended loads

[SelectionDAG] Don't inspect !range metadata for extended loads

Summary:
Don't call `computeKnownBitsFromRangeMetadata` for extended loads --
this can cause a mismatch between the width of the !range metadata and
the width of the APInt's accumulating `KnownZero` (and `KnownOne` in the
future).  This isn't a problem now, but will be after a future change.

Note: this can be made more aggressive in the future.

Reviewers: nlewycky

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D14107

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@251486 91177308-0d34-0410-b5e6-96231b3b80d8