Revert r194865 and r194874.

This change is incorrect. If you delete virtual destructor of both a base class
and a subclass, then the following code:
  Base *foo = new Child();
  delete foo;
will not cause the destructor for members of Child class. As a result, I observe
plently of memory leaks. Notable examples I investigated are:
ObjectBuffer and ObjectBufferStream, AttributeImpl and StringSAttributeImpl.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194997 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/SystemZ/SystemZInstrInfo.cpp

@@ -17,7 +17,7 @@
 #include "llvm/CodeGen/LiveVariables.h"
 #include "llvm/CodeGen/MachineRegisterInfo.h"
 
-#define GET_INSTRINFO_CTOR_DTOR
+#define GET_INSTRINFO_CTOR
 #define GET_INSTRMAP_INFO
 #include "SystemZGenInstrInfo.inc"
 
@@ -37,9 +37,6 @@ static bool isHighReg(unsigned int Reg) {
   return false;
 }
 
-// pin vtable to this file
-void SystemZInstrInfo::anchor() {}
-
 SystemZInstrInfo::SystemZInstrInfo(SystemZTargetMachine &tm)
   : SystemZGenInstrInfo(SystemZ::ADJCALLSTACKDOWN, SystemZ::ADJCALLSTACKUP),
     RI(tm), TM(tm) {