Automatically discard global effects in the rare passes that add effects (#5999)

All logging/instrumentation passes need to do this, to avoid us using stale
global effects that are too low (too high is not optimal either, but at least it
cannot cause bugs).

1 files changed, 3 insertions, 0 deletions

diff --git a/src/passes/SpillPointers.cpp b/src/passes/SpillPointers.cpp
index f496b8c79..3af7039cd 100644
--- a/src/passes/SpillPointers.cpp
+++ b/src/passes/SpillPointers.cpp
@@ -37,6 +37,9 @@ struct SpillPointers
   : public WalkerPass<LivenessWalker<SpillPointers, Visitor<SpillPointers>>> {
   bool isFunctionParallel() override { return true; }
 
+  // Adds writes to memory.
+  bool addsEffects() override { return true; }
+
   std::unique_ptr<Pass> create() override {
     return std::make_unique<SpillPointers>();
   }