[PATCH] Use enums instead of unsigned where possible

[Ed Maste]

Add comment suggested by echristo

It turns out I missed a related llvm change in the diff (included here)  - should I put it in a separate LLVM review?  (Or put the cast in CGDebugInfo.cpp?)
--- a/include/llvm/DebugInfo.h                                                  
+++ b/include/llvm/DebugInfo.h                                                  
@@ -413,7 +413,9 @@ class DICompileUnit : public DIScope {                      
 public:                                                                        
   explicit DICompileUnit(const MDNode *N = 0) : DIScope(N) {}                  
                                                                                
-  unsigned getLanguage() const { return getUnsignedField(2); }                 
+  llvm::dwarf::SourceLanguage getLanguage() const {                            
+    return static_cast<llvm::dwarf::SourceLanguage>(getUnsignedField(2));      
+  }                                                                            
   StringRef getProducer() const { return getStringField(3); }                  
                                                                                
   bool isOptimized() const { return getUnsignedField(4) != 0; }

http://reviews.llvm.org/D3626

Files:
  lib/CodeGen/CGDebugInfo.cpp
  lib/CodeGen/CGDebugInfo.h
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