PNaCl: Add ExpandGetElementPtr pass for converting GetElementPtr to arithmetic

This is similar to the GEP handling in visitGetElementPtr() in
lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp.

Once this pass is enabled, it will simplify the language to reduce the
set of constructs that a PNaCl translator needs to handle as part of a
stable wire format for PNaCl.

BUG=https://code.google.com/p/nativeclient/issues/detail?id=3343
TEST=test/Transforms/NaCl/expand-getelementptr.ll

Review URL: https://codereview.chromium.org/12849009

1 files changed, 1 insertions, 0 deletions

diff --git a/tools/opt/opt.cpp b/tools/opt/opt.cpp
index 337419553a..c682768164 100644
--- a/tools/opt/opt.cpp
+++ b/tools/opt/opt.cpp
@@ -579,6 +579,7 @@ int main(int argc, char **argv) {
   // @LOCALMOD-BEGIN
   initializeExpandConstantExprPass(Registry);
   initializeExpandCtorsPass(Registry);
+  initializeExpandGetElementPtrPass(Registry);
   initializeExpandTlsPass(Registry);
   initializeExpandTlsConstantExprPass(Registry);
   initializeExpandVarArgsPass(Registry);