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

This pass expands out the "byval" and "sret" argument attributes.

This will affect the calling conventions for PPAPI under PNaCl (for
passing PP_Var etc. by value), so the PNaCl PPAPI shims will need to
be updated in order to enable this pass by default.

BUG=https://code.google.com/p/nativeclient/issues/detail?id=3400
TEST=PNaCl toolchain trybots + GCC torture tests + LLVM test suite + Spec2k

Review URL: https://codereview.chromium.org/13973018

1 files changed, 1 insertions, 0 deletions

diff --git a/tools/opt/opt.cpp b/tools/opt/opt.cpp
index ff6e5effeb..26a5e4a3c1 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);