[SystemZ] Remove an unused TableGen class.

[kosarev]

Summary

And warn on unused classes and metaclasses from now on.

[uweigand]

LGTM, thanks.

llvm/lib/Target/SystemZ/CMakeLists.txt

 add_llvm_component_group(SystemZ HAS_JIT)
 
 set(LLVM_TARGET_DEFINITIONS SystemZ.td)
 
 tablegen(LLVM SystemZGenAsmMatcher.inc -gen-asm-matcher)
 tablegen(LLVM SystemZGenAsmWriter.inc -gen-asm-writer)
 tablegen(LLVM SystemZGenCallingConv.inc -gen-callingconv)
-tablegen(LLVM SystemZGenDAGISel.inc -gen-dag-isel)
+tablegen(LLVM SystemZGenDAGISel.inc -gen-dag-isel -warn-on-unused-entities)
 tablegen(LLVM SystemZGenDisassemblerTables.inc -gen-disassembler)
 tablegen(LLVM SystemZGenInstrInfo.inc -gen-instr-info)
 tablegen(LLVM SystemZGenMCCodeEmitter.inc -gen-emitter)
 tablegen(LLVM SystemZGenRegisterInfo.inc -gen-register-info)
 tablegen(LLVM SystemZGenSubtargetInfo.inc -gen-subtarget)
 
 add_public_tablegen_target(SystemZCommonTableGen)
 

llvm/lib/Target/SystemZ/SystemZOperators.td

def z_any_vround  : PatFrags<(ops node:$src),
                              [(z_strict_vround node:$src),
                               (z_vround node:$src)]>;
 
 // Create a unary operator that loads from memory and then performs
 // the given operation on it.
 class loadu<SDPatternOperator operator, SDPatternOperator load = load>
   : PatFrag<(ops node:$addr), (operator (load node:$addr))>;
 
-// Create a store operator that performs the given unary operation
-// on the value before storing it.
-class storeu<SDPatternOperator operator, SDPatternOperator store = store>
-  : PatFrag<(ops node:$value, node:$addr),
-            (store (operator node:$value), node:$addr)>;
-
 // Create a store operator that performs the given inherent operation
 // and stores the resulting value.
 class storei<SDPatternOperator operator, SDPatternOperator store = store>
   : PatFrag<(ops node:$addr),
             (store (operator), node:$addr)>;
 
 // Create a shift operator that optionally ignores an AND of the
 // shift count with an immediate if the bottom 6 bits are all set.