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

src/IceTargetLowering.h

Index: src/IceTargetLowering.h
diff --git a/src/IceTargetLowering.h b/src/IceTargetLowering.h
index 50035747cbf33b652bdeb789994b3478a1fec785..8f8a4e2bcb31a5ae0c1c82b37bcdb6e7e16eed08 100644
--- a/src/IceTargetLowering.h
+++ b/src/IceTargetLowering.h
@@ -254,6 +254,10 @@ protected:
   // expansion before returning.
   virtual void postLower() {}
 
+  // Find two-address non-SSA instructions and set the DestNonKillable flag
+  // to keep liveness analysis consistent.
+  void inferTwoAddress();
+
   // Make a call to an external helper function.
   InstCall *makeHelperCall(const IceString &Name, Variable *Dest,
                            SizeT MaxSrcs);