note changes when removing an if body in vacuum

Author: kripken

src/passes/Vacuum.cpp

@@ -234,6 +234,10 @@ struct Vacuum : public WalkerPass<PostWalker<Vacuum>> {
     }
     // if the condition is unreachable, just return it
     if (curr->condition->type == unreachable) {
+      typeUpdater.noteRecursiveRemoval(curr->ifTrue);
+      if (curr->ifFalse) {
+        typeUpdater.noteRecursiveRemoval(curr->ifFalse);
+      }
       replaceCurrent(curr->condition);
       return;
     }

test/passes/vacuum.txt

@@ -287,4 +287,18 @@
    )
   )
  )
+ (func $if-arm-vanishes (type $3) (result i32)
+  (block $label$0 (result i32)
+   (br $label$0
+    (i32.const 1)
+   )
+  )
+ )
+ (func $if-arm-vanishes-2 (type $3) (result i32)
+  (block $label$0 (result i32)
+   (br $label$0
+    (i32.const 1)
+   )
+  )
+ )
 )

test/passes/vacuum.wast

@@ -611,4 +611,30 @@
     )
    )
   )
+  (func $if-arm-vanishes (result i32)
+   (block $label$0 (result i32)
+    (block $label$1
+     (if
+      (br $label$0
+       (i32.const 1)
+      )
+      (br $label$1)
+     )
+    )
+    (i32.const 1579493952)
+   )
+  )
+  (func $if-arm-vanishes-2 (result i32)
+   (block $label$0 (result i32)
+    (block $label$1
+     (if
+      (br $label$0
+       (i32.const 1)
+      )
+      (br $label$1)
+     )
+    )
+    (i32.const 1579493952)
+   )
+  )
 )