PNaCl: Add ExpandByVal pass for expanding out by-value struct args and results

tools/opt/opt.cpp

Index: tools/opt/opt.cpp
diff --git a/tools/opt/opt.cpp b/tools/opt/opt.cpp
index 2998a047cf7747dc083edd621a67d2c4894ed1d8..79ffb8c6046ddad544aa178d5357225fb9cda411 100644
--- a/tools/opt/opt.cpp
+++ b/tools/opt/opt.cpp
@@ -577,6 +577,7 @@ int main(int argc, char **argv) {
   initializeInstrumentation(Registry);
   initializeTarget(Registry);
   // @LOCALMOD-BEGIN
+  initializeExpandByValPass(Registry);
   initializeExpandConstantExprPass(Registry);
   initializeExpandCtorsPass(Registry);
   initializeExpandGetElementPtrPass(Registry);