Missing includes

[CrisCristescu]

Summary

When building llvm self-hosted with modules there are some missing includes which prevent the modules to be built.

[rsmith]

Assuming you've tested that these header files don't compile standalone without these changes, and do compile standalone with these changes, this LGTM.

[CrisCristescu]

Correct diff.

[v.g.vassilev]

Landed in r274004.

include/llvm/CodeGen/PBQP/Graph.h

 //
 //===----------------------------------------------------------------------===//
 
 
 #ifndef LLVM_CODEGEN_PBQP_GRAPH_H
 #define LLVM_CODEGEN_PBQP_GRAPH_H
 
 #include "llvm/Support/Debug.h"
+#include <algorithm>
+#include <cassert>
+#include <limits>
 #include <utility>
 #include <vector>
 
 namespace llvm {
 namespace PBQP {
 
   class GraphBase {
   public:

include/llvm/IR/UseListOrder.h

 // This file has structures and command-line options for preserving use-list
 // order.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_IR_USELISTORDER_H
 #define LLVM_IR_USELISTORDER_H
 
+#include <cstddef>
 #include <vector>
 
 namespace llvm {
 
 class Module;
 class Function;
 class Value;
 

include/llvm/MC/MCSymbol.h

 
 #ifndef LLVM_MC_MCSYMBOL_H
 #define LLVM_MC_MCSYMBOL_H
 
 #include "llvm/ADT/PointerIntPair.h"
 #include "llvm/ADT/PointerUnion.h"
 #include "llvm/ADT/StringMap.h"
 #include "llvm/MC/MCAssembler.h"
+#include "llvm/MC/MCFragment.h"
 #include "llvm/Support/Compiler.h"
 
 namespace llvm {
 class MCAsmInfo;
 class MCExpr;
 class MCSymbol;
 class MCFragment;
 class MCSection;