Subzero ARM: lowerArguments (GPR), basic legalize(), and lowerRet(i32, i64).

src/IceInst.h

Index: src/IceInst.h
diff --git a/src/IceInst.h b/src/IceInst.h
index e3262c83d8dee23590b63d96981806321ed45bf5..e6b973fabc8476338e43e0365a23b61cb0a9cb53 100644
--- a/src/IceInst.h
+++ b/src/IceInst.h
@@ -67,6 +67,10 @@ public:
     FakeKill,     // not part of LLVM/PNaCl bitcode
     Target        // target-specific low-level ICE
                   // Anything >= Target is an InstTarget subclass.
+                  // Note that the value-spaces are shared across targets.
+                  // To avoid confusion over the definition of shared values,
+                  // an object specific to one target should never be passed
+                  // to a different target.
   };
   InstKind getKind() const { return Kind; }
 
@@ -923,6 +927,8 @@ protected:
   ~InstTarget() override {}
 };
 
+bool checkForRedundantAssign(const Variable *Dest, const Operand *Source);
+
 } // end of namespace Ice
 
 namespace llvm {