[modules] Stop excluding Support/Debug.h from the Support module. This header

has been modular since r206822, and excluding it was leading to workarounds
such as the one in r219592, which this change removes.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219593 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Analysis/BlockFrequencyInfoImpl.cpp

@@ -13,7 +13,6 @@
 
 #include "llvm/Analysis/BlockFrequencyInfoImpl.h"
 #include "llvm/ADT/SCCIterator.h"
-#include "llvm/Support/Debug.h"
 #include "llvm/Support/raw_ostream.h"
 
 using namespace llvm;