Rebased PNaCl localmods in LLVM to 223109

lib/Transforms/MinSFI/StripTls.cpp

+//===- StripTls.cpp - Remove the thread_local attribute from variables ----===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Runtime support for thread-local storage depends on pthreads which are
+// currently not supported by MinSFI. This pass removes the thread_local
+// attribute from all global variables until thread support is in place.
+//
+// The pass should be invoked before the pnacl-abi-simplify passes.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Pass.h"
+#include "llvm/IR/GlobalVariable.h"
+#include "llvm/IR/Module.h"
+
+using namespace llvm;
+
+namespace {
+class StripTls : public ModulePass {
+ public:
+  static char ID;
+  StripTls() : ModulePass(ID) {
+    initializeStripTlsPass(*PassRegistry::getPassRegistry());
+  }
+
+  virtual bool runOnModule(Module &M);
+};
+}  // namespace
+
+bool StripTls::runOnModule(Module &M) {
+  bool Changed = false;
+  for (Module::global_iterator GV = M.global_begin(), E = M.global_end();
+       GV != E; ++GV) {
+    if (GV->isThreadLocal()) {
+      GV->setThreadLocal(false);
+      Changed = true;
+    }
+  }
+  return Changed;
+}
+
+char StripTls::ID = 0;
+INITIALIZE_PASS(StripTls, "minsfi-strip-tls",
+                "Remove the thread_local attribute from variables",
+                false, false)