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[AggressiveInstCombine] Make TruncCombine class ignore unreachable basic blocks.

Description

[AggressiveInstCombine] Make TruncCombine class ignore unreachable basic blocks.
Because dead code may contain non-standard IR that causes infinite looping or crashes in underlying analysis.
See PR36134 for more details.

Differential Revision: https://reviews.llvm.org/D42683

Details

Committed
aaboudJan 31 2018, 2:41 AM
Differential Revision
D42683: [AggressiveInstCombine] fixed PR36134
Parents
rL323861: [ARM] Armv8.2-A FP16 code generation (part 2/3)
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