Subzero: Transform suitable Load/Arith/Store sequences into RMW ops.

src/IceDefs.h

Index: src/IceDefs.h
diff --git a/src/IceDefs.h b/src/IceDefs.h
index 71a23f66072b39e03540c795dc54f7f4b243c51a..0a1fdd11326693dcd41e5b5be2aabddcaa6008b6 100644
--- a/src/IceDefs.h
+++ b/src/IceDefs.h
@@ -173,6 +173,7 @@ enum VerboseItem {
   IceV_AddrOpt = 1 << 9,
   IceV_Random = 1 << 10,
   IceV_Folding = 1 << 11,
+  IceV_RMW = 1 << 12,
   IceV_All = ~IceV_None,
   IceV_Most = IceV_All & ~IceV_LinearScan
 };