Rebased PNaCl localmods in LLVM to 223109

lib/CodeGen/LLVMTargetMachine.cpp

Index: lib/CodeGen/LLVMTargetMachine.cpp
diff --git a/lib/CodeGen/LLVMTargetMachine.cpp b/lib/CodeGen/LLVMTargetMachine.cpp
index 61face27f149557c80bf49f42bdfd2b341df94d7..3142db9262c88c4ff8862a58394c0b41ed6dacd1 100644
--- a/lib/CodeGen/LLVMTargetMachine.cpp
+++ b/lib/CodeGen/LLVMTargetMachine.cpp
@@ -145,6 +145,9 @@ bool LLVMTargetMachine::addPassesToEmitFile(PassManagerBase &PM,
                                             AnalysisID StopAfter) {
   // Passes to handle jumptable function annotations. These can't be handled at
   // JIT time, so we don't add them directly to addPassesToGenerateCode.
+  // @LOCALMOD: When there is no ModulePassManager in the PMStack, the
+  // JumpInstrTablesPass will silently be dropped and not added to the pass
+  // manager, because it is a module pass.
   PM.add(createJumpInstrTableInfoPass(
       getSubtargetImpl()->getInstrInfo()->getJumpInstrTableEntryBound()));
   PM.add(createJumpInstrTablesPass(Options.JTType));