Lower signatures exposing struct registers to byval struct pointers

tools/bugpoint/bugpoint.cpp

Index: tools/bugpoint/bugpoint.cpp
diff --git a/tools/bugpoint/bugpoint.cpp b/tools/bugpoint/bugpoint.cpp
index 2e7299a4676a426ceff91bee74465b86aa51f25d..1e395db4da6990e9fa3b1747be5a885e23410205 100644
--- a/tools/bugpoint/bugpoint.cpp
+++ b/tools/bugpoint/bugpoint.cpp
@@ -161,6 +161,7 @@ int main(int argc, char **argv) {
   initializeGlobalCleanupPass(Registry);
   initializeGlobalizeConstantVectorsPass(Registry);
   initializeInsertDivideCheckPass(Registry);
+  initializeSimplifyStructRegSignaturesPass(Registry);
   initializePNaClABIVerifyFunctionsPass(Registry);
   initializePNaClABIVerifyModulePass(Registry);
   initializePNaClSjLjEHPass(Registry);