Factor some of the constants+context related code out into a separate header, to make LLVMContextImpl.h

not hideous.  Also, fix some MSVC compile errors.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78115 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Transforms/Utils/Cloning.h

@@ -38,7 +38,7 @@ class CallGraph;
 class TargetData;
 class Loop;
 class LoopInfo;
-class LLVMContext;
+struct LLVMContext;
 
 /// CloneModule - Return an exact copy of the specified module
 ///

include/llvm/Transforms/Utils/Local.h

@@ -27,7 +27,7 @@ class PHINode;
 class AllocaInst;
 class ConstantExpr;
 class TargetData;
-class LLVMContext;
+struct LLVMContext;
 struct DbgInfoIntrinsic;
 
 template<typename T> class SmallVectorImpl;

include/llvm/Transforms/Utils/PromoteMemToReg.h

@@ -23,7 +23,7 @@ class AllocaInst;
 class DominatorTree;
 class DominanceFrontier;
 class AliasSetTracker;
-class LLVMContext;
+struct LLVMContext;
 
 /// isAllocaPromotable - Return true if this alloca is legal for promotion.
 /// This is true if there are only loads and stores to the alloca...

include/llvm/Transforms/Utils/ValueMapper.h

@@ -20,7 +20,7 @@
 namespace llvm {
   class Value;
   class Instruction;
-  class LLVMContext;
+  struct LLVMContext;
   typedef DenseMap<const Value *, Value *> ValueMapTy;
 
   Value *MapValue(const Value *V, ValueMapTy &VM, LLVMContext &Context);