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[X86] X86DAGToDAGISel::matchBitExtract(): pattern b: truncation awareness

Description

[X86] X86DAGToDAGISel::matchBitExtract(): pattern b: truncation awareness

Summary:
(Not so) boringly identical to pattern a (D62786)
Not yet sure how do deal with the last pattern c.

Reviewers: RKSimon, craig.topper, spatel

Reviewed By: RKSimon

Subscribers: llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D62793