Move remaining LLVM_ENABLE_DUMP conditionals out of the headers

This macro is sometimes defined manually but isn't (and doesn't need to be) in
llvm-config.h so shouldn't appear in the headers, likewise NDEBUG.

Instead switch them over to LLVM_DUMP_METHOD on the definitions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212130 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/MachineScheduler.h

@@ -518,9 +518,7 @@ public:
     return Queue.begin() + idx;
   }
 
-#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
   void dump();
-#endif
 };
 
 /// Summarize the unscheduled region.