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[X86][SSE] Add PACKSS SimplifyMultipleUseDemandedBits 'sign bit' handling.

Authored by RKSimon on Jan 20 2020, 2:48 AM.

Description

[X86][SSE] Add PACKSS SimplifyMultipleUseDemandedBits 'sign bit' handling.

Attempt to use SimplifyMultipleUseDemandedBits to simplify PACKSS if we're only after the sign bit.

Details

Committed
RKSimonJan 20 2020, 2:48 AM
Parents
rG06e73f071ae1: [lldb/DWARF] Change how we construct a llvm::DWARFContext
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