Rebased PNaCl localmods in LLVM to 223109

lib/IR/InlineAsm.cpp

Index: lib/IR/InlineAsm.cpp
diff --git a/lib/IR/InlineAsm.cpp b/lib/IR/InlineAsm.cpp
index 16d874f32fc39a76eb684d9a9cfe9e484822f05f..32a5ea8be2d9f15518d07be6046204f81ee7a5e2 100644
--- a/lib/IR/InlineAsm.cpp
+++ b/lib/IR/InlineAsm.cpp
@@ -287,3 +287,18 @@ bool InlineAsm::Verify(FunctionType *Ty, StringRef ConstStr) {
   return true;
 }
 
+// @LOCALMOD-START
+bool InlineAsm::isAsmMemory() const {
+  bool retVoid = getFunctionType()->getReturnType()->isVoidTy();
+  bool noArgs = getFunctionType()->getNumParams() == 0 &&
+      !getFunctionType()->isVarArg();
+  bool isEmptyAsm = AsmString.empty();
+  // Different triples will encode "touch everything" differently, e.g.:
+  //  - le32-unknown-nacl has "~{memory}".
+  //  - x86 "~{memory},~{dirflag},~{fpsr},~{flags}".
+  // The following code therefore only searches for memory.
+  bool touchesMemory = Constraints.find("~{memory}") != std::string::npos;
+
+  return retVoid && noArgs && hasSideEffects() && isEmptyAsm && touchesMemory;
+}
+// @LOCALMOD-END