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[Attributor][FIX] Avoid splitting blocks if possible

Description

[Attributor][FIX] Avoid splitting blocks if possible

Before, we eagerly split blocks even if it was not necessary, e.g., they
had a single unreachable instruction and only a single predecessor.

Details

Committed
jdoerfertOct 12 2019, 10:27 PM
Parents
rL374702: [Attributor][FIX] Remove leftover, now unused, variable
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