PNaCl: Implement computed gotos (indirectbr) by expanding out to switches

lib/Transforms/NaCl/PNaClABISimplify.cpp

Index: lib/Transforms/NaCl/PNaClABISimplify.cpp
diff --git a/lib/Transforms/NaCl/PNaClABISimplify.cpp b/lib/Transforms/NaCl/PNaClABISimplify.cpp
index d695f61203726505bd414d04043195ca7c1a8932..91729c253ba731eddff2e49cedc63e7598182a83 100644
--- a/lib/Transforms/NaCl/PNaClABISimplify.cpp
+++ b/lib/Transforms/NaCl/PNaClABISimplify.cpp
@@ -47,6 +47,9 @@ void llvm::PNaClABISimplifyAddPreOptPasses(PassManager &PM) {
   const char *SymbolsToPreserve[] = { "_start" };
   PM.add(createInternalizePass(SymbolsToPreserve));
 
+  // Expand out computed gotos (indirectbr and blockaddresses) into switches.
+  PM.add(createExpandIndirectBrPass());
+
   // LowerExpect converts Intrinsic::expect into branch weights,
   // which can then be removed after BlockPlacement.
   PM.add(createLowerExpectIntrinsicPass());