Craig Topper deaeb16d88 [RISCV] Indicate that RISCVMergeBaseOffsetOpt preserves the CFG. ...

Return false from runOnFunction if nothing changed. Curiously
we already returned a bool from detectAndFoldOffset, but didn't
use it.

Fix a couple breaks after returns that I saw while auditing
detectAndFoldOffset.

Differential Revision: https://reviews.llvm.org/D107303

2021-08-03 08:32:36 -07:00

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