Poppify pass

src/pass.h

@@ -171,6 +171,12 @@ struct PassRunner {
   PassRunner(const PassRunner&) = delete;
   PassRunner& operator=(const PassRunner&) = delete;
 
+  // But we can make it easy to create a nested runner
+  // TODO: Go through and use this in more places
+  explicit PassRunner(const PassRunner* runner)
+    : wasm(runner->wasm), allocator(runner->allocator),
+      options(runner->options), isNested(true) {}
+
   void setDebug(bool debug) {
     options.debug = debug;
     // validate everything by default if debugging

src/passes/CMakeLists.txt

@@ -49,6 +49,7 @@ set(passes_SOURCES
   OptimizeAddedConstants.cpp
   OptimizeInstructions.cpp
   PickLoadSigns.cpp
+  Poppify.cpp
   PostAssemblyScript.cpp
   PostEmscripten.cpp
   Precompute.cpp