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 91f9f5c017b4d3ace6733d8c2810e90005637488..af8298651cfc60e1b8a6b89467633ed308d40c17 100644
--- a/tools/bugpoint/bugpoint.cpp
+++ b/tools/bugpoint/bugpoint.cpp
@@ -165,6 +165,7 @@ int main(int argc, char **argv) {
   initializeGlobalCleanupPass(Registry);
   initializeGlobalizeConstantVectorsPass(Registry);
   initializeInsertDivideCheckPass(Registry);
+  initializeSimplifyStructRegSignaturesPass(Registry);
   initializePNaClABIVerifyFunctionsPass(Registry);
   initializePNaClABIVerifyModulePass(Registry);
   initializePNaClSjLjEHPass(Registry);