Explicitly request unsigned enum types when desired

This fixes repeated -Wmicrosoft warnings when self-hosting clang on
Windows, and gets us real unsigned enum types with MSVC.

llvm-svn: 192227

include/llvm/CodeGen/ScheduleDAG.h

@@ -248,7 +248,7 @@ namespace llvm {
   /// SUnit - Scheduling unit. This is a node in the scheduling DAG.
   class SUnit {
   private:
-    enum { BoundaryID = ~0u };
+    enum LLVM_ENUM_INT_TYPE(unsigned) { BoundaryID = ~0u };
 
     SDNode *Node;                       // Representative node.
     MachineInstr *Instr;                // Alternatively, a MachineInstr.

lib/CodeGen/RegAllocFast.cpp

@@ -144,7 +144,7 @@ namespace {
     // not be erased.
     bool isBulkSpilling;
 
-    enum {
+    enum LLVM_ENUM_INT_TYPE(unsigned) {
       spillClean = 1,
       spillDirty = 100,
       spillImpossible = ~0u

lib/CodeGen/RegAllocGreedy.cpp

@@ -222,7 +222,7 @@ class RAGreedy : public MachineFunctionPass,
   /// class.
   SmallVector<GlobalSplitCandidate, 32> GlobalCand;
 
-  enum { NoCand = ~0u };
+  enum LLVM_ENUM_INT_TYPE(unsigned) { NoCand = ~0u };
 
   /// Candidate map. Each edge bundle is assigned to a GlobalCand entry, or to
   /// NoCand which indicates the stack interval.