PNaCl: Add ExpandSmallArguments pass to widen parameters to 32 bits

This widens i1, i8 and i16 function arguments and return types.

Factor out RecreateFunction() helper function from existing PNaCl
passes since this is a reoccurring code fragment.

BUG=https://code.google.com/p/nativeclient/issues/detail?id=3342
TEST=*.ll tests + PNaCl toolchain trybots + GCC torture tests + LLVM test suite

Review URL: https://codereview.chromium.org/15971007

1 files changed, 1 insertions, 0 deletions

diff --git a/tools/opt/opt.cpp b/tools/opt/opt.cpp
index e44cfe06f4..bec40a97d9 100644
--- a/tools/opt/opt.cpp
+++ b/tools/opt/opt.cpp
@@ -604,6 +604,7 @@ int main(int argc, char **argv) {
   initializeExpandConstantExprPass(Registry);
   initializeExpandCtorsPass(Registry);
   initializeExpandGetElementPtrPass(Registry);
+  initializeExpandSmallArgumentsPass(Registry);
   initializeExpandTlsPass(Registry);
   initializeExpandTlsConstantExprPass(Registry);
   initializeExpandVarArgsPass(Registry);