Fix up header comments to make Chris happy.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74537 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/LLVMContext.h

@@ -6,6 +6,11 @@
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
+//
+// This file declares LLVMContext, a container of "global" state in LLVM, such
+// as the global type and constant uniquing tables.
+//
+//===----------------------------------------------------------------------===//
 
 #ifndef LLVM_LLVMCONTEXT_H
 #define LLVM_LLVMCONTEXT_H
@@ -35,6 +40,11 @@ class APInt;
 class APFloat;
 class Value;
 
+/// This is an important class for using LLVM in a threaded context.  It
+/// (opaquely) owns and manages the core "global" data of LLVM's core 
+/// infrastructure, including the type and constant uniquing tables.
+/// LLVMContext itself provides no locking guarantees, so you should be careful
+/// to have one context per thread.
 class LLVMContext {
   LLVMContextImpl* pImpl;
 public:

lib/VMCore/LLVMContext.cpp

@@ -6,6 +6,11 @@
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
+//
+//  This file implements LLVMContext, as a wrapper around the opaque
+// class LLVMContextImpl.
+//
+//===----------------------------------------------------------------------===//
 
 #include "llvm/LLVMContext.h"
 #include "llvm/Constants.h"

lib/VMCore/LLVMContextImpl.h

@@ -6,6 +6,11 @@
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
+//
+//  This file declares LLVMContextImpl, the opaque implementation 
+//  of LLVMContext.
+//
+//===----------------------------------------------------------------------===//
 
 #ifndef LLVM_LLVMCONTEXT_IMPL_H
 #define LLVM_LLVMCONTEXT_IMPL_H
@@ -17,4 +22,4 @@ class LLVMContextImpl {
 
 }
 
-#endif
+#endif