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[InstCombine] reduce raw IR narrowing rotate patterns to funnel shift

Description

[InstCombine] reduce raw IR narrowing rotate patterns to funnel shift

Similar to rL350199 - there are no known analysis/codegen holes for
funnel shift intrinsics now, so we can canonicalize the 6+ regular
instructions to funnel shift to improve vectorization, inlining,
unrolling, etc.

Details

Committed
spatelFri, Jan 4, 9:38 AM
Parents
rL350418: [gn build] Merge r350351
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