[Sparc] EXPENSIVE_CHECKS now passes all machine verifier errors (PR27461)

Now that D51487 has landed, the last machine verifier tests that failed EXPENSIVE_CHECKS builds have now been fixed/removed, so we can remove @MatzeB 's isMachineVerifierClean() hack for sparc targets.

Differential Revision: https://reviews.llvm.org/D52612

llvm-svn: 343232

llvm/lib/Target/Sparc/SparcTargetMachine.h

@@ -40,10 +40,6 @@ public:
   TargetLoweringObjectFile *getObjFileLowering() const override {
     return TLOF.get();
   }
-
-  bool isMachineVerifierClean() const override {
-    return false;
-  }
 };
 
 /// Sparc 32-bit target machine