Fix MCJIT memory leak of owned TargetMachine.

The JIT is expected to take ownership of the TM that's passed in. The MCJIT
wasn't freeing it, resulting in leaks.

llvm-svn: 148356

llvm/lib/ExecutionEngine/MCJIT/MCJIT.cpp

@@ -85,6 +85,7 @@ MCJIT::MCJIT(Module *m, TargetMachine *tm, TargetJITInfo &tji,
 
 MCJIT::~MCJIT() {
   delete MemMgr;
+  delete TM;
 }
 
 void *MCJIT::getPointerToBasicBlock(BasicBlock *BB) {