Add PNaClSjLjEH pass to implement C++ exception handling using setjmp()+longjmp()

There are two parts to this:

 * PNaClSjLjEH.cpp expands out the "invoke", "landingpad" and "resume"
   instructions, modifying the control flow to use setjmp().

 * ExceptionInfoWriter.cpp lowers landingpads' clause lists to data
   that PNaCl's C++ runtime library will interpret.  This part will be
   reused when we drop the SjLj part and create a stable ABI for
   zero-cost EH.

This pass isn't enabled in PNaClABISimplify yet: I'll do that in a
separate change.

BUG=https://code.google.com/p/nativeclient/issues/detail?id=3696
TEST=*.ll tests (also tested end-to-end: plumbing for this will follow later)

Review URL: https://codereview.chromium.org/24777002

1 files changed, 1 insertions, 0 deletions

diff --git a/tools/opt/opt.cpp b/tools/opt/opt.cpp
index e0ea24a9d8..f13ba04229 100644
--- a/tools/opt/opt.cpp
+++ b/tools/opt/opt.cpp
@@ -629,6 +629,7 @@ int main(int argc, char **argv) {
   initializeInsertDivideCheckPass(Registry);
   initializePNaClABIVerifyFunctionsPass(Registry);
   initializePNaClABIVerifyModulePass(Registry);
+  initializePNaClSjLjEHPass(Registry);
   initializePromoteI1OpsPass(Registry);
   initializePromoteIntegersPass(Registry);
   initializeRemoveAsmMemoryPass(Registry);