[SystemZ] Remove unwanted part from last commit

I was originally going to use MVC for memmove too, but that's less of
a clear win.  Remove some accidental left-overs in the previous commit.

llvm-svn: 185804

llvm/lib/Target/SystemZ/SystemZISelLowering.cpp

@@ -245,8 +245,6 @@ SystemZTargetLowering::SystemZTargetLowering(SystemZTargetMachine &tm)
   // We want to use MVC in preference to even a single load/store pair.
   MaxStoresPerMemcpy = 0;
   MaxStoresPerMemcpyOptSize = 0;
-  MaxStoresPerMemmove = 0;
-  MaxStoresPerMemmoveOptSize = 0;
 }
 
 bool SystemZTargetLowering::isFPImmLegal(const APFloat &Imm, EVT VT) const {