Plug a memory leak in the asmparser. It turns out that we were leaking

the strings for basic block labels in some cases.  This amounted to about
120K of memory for namd, a medium sized program.

llvm-svn: 17262

llvm/lib/AsmParser/llvmAsmParser.y

@@ -405,7 +405,7 @@ static BasicBlock *getBBVal(const ValID &ID, bool isDefinition = false) {
     CurFun.CurrentFunction->getBasicBlockList().remove(BB);
     CurFun.CurrentFunction->getBasicBlockList().push_back(BB);
   }
-
+  ID.destroy();
   return BB;
 }