Make LLVMContext and LLVMContextImpl classes instead of structs.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78690 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Analysis/ConstantFolding.h

@@ -22,7 +22,7 @@ namespace llvm {
   class TargetData;
   class Function;
   class Type;
-  struct LLVMContext;
+  class LLVMContext;
 
 /// ConstantFoldInstruction - Attempt to constant fold the specified
 /// instruction.  If successful, the constant result is returned, if not, null

include/llvm/Analysis/DebugInfo.h

@@ -40,7 +40,7 @@ namespace llvm {
   class DebugLoc;
   struct DebugLocTracker;
   class Instruction;
-  struct LLVMContext;
+  class LLVMContext;
 
   class DIDescriptor {
   protected:    

include/llvm/Analysis/ScalarEvolution.h

@@ -41,7 +41,7 @@ namespace llvm {
   class Type;
   class ScalarEvolution;
   class TargetData;
-  struct LLVMContext;
+  class LLVMContext;
   class Loop;
   class LoopInfo;
   class Operator;

include/llvm/Analysis/SparsePropagation.h

@@ -31,7 +31,7 @@ namespace llvm {
   class BasicBlock;
   class Function;
   class SparseSolver;
-  struct LLVMContext;
+  class LLVMContext;
 
   template<typename T> class SmallVectorImpl;
   

include/llvm/Analysis/ValueTracking.h

@@ -23,7 +23,7 @@ namespace llvm {
   class Instruction;
   class APInt;
   class TargetData;
-  struct LLVMContext;
+  class LLVMContext;
   
   /// ComputeMaskedBits - Determine which of the bits specified in Mask are
   /// known to be either zero or one and return them in the KnownZero/KnownOne