MergeBlocks: optimize If conditions (#4260)

Code in the If condition can be moved out to before the if.

Existing test updates are 99% whitespace.

1 files changed, 5 insertions, 0 deletions

diff --git a/src/passes/MergeBlocks.cpp b/src/passes/MergeBlocks.cpp
index b77dbef83..6ba486717 100644
--- a/src/passes/MergeBlocks.cpp
+++ b/src/passes/MergeBlocks.cpp
@@ -520,6 +520,11 @@ struct MergeBlocks
     }
   }
 
+  void visitIf(If* curr) {
+    // We can move code out of the condition, but not any of the other children.
+    optimize(curr, curr->condition);
+  }
+
   void optimizeTernary(Expression* curr,
                        Expression*& first,
                        Expression*& second,