Improve portability to compilers where <cassert> is not implicitly

included.  Patch contributed by Benoit Boissinot!


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@39779 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/Basic/SourceManager.h

@@ -18,6 +18,7 @@
 #include <vector>
 #include <map>
 #include <list>
+#include <cassert>
 
 namespace llvm {
 class MemoryBuffer;

include/clang/Lex/IdentifierTable.h

@@ -17,6 +17,7 @@
 #include "clang/Basic/TokenKinds.h"
 #include "llvm/ADT/StringMap.h"
 #include <string> 
+#include <cassert> 
 
 namespace clang {
   class MacroInfo;

include/clang/Lex/Lexer.h

@@ -19,6 +19,7 @@
 #include "clang/Basic/LangOptions.h"
 #include <string>
 #include <vector>
+#include <cassert>
 
 namespace llvm {
   class MemoryBuffer;

include/clang/Lex/MacroInfo.h

@@ -16,6 +16,7 @@
 
 #include "clang/Lex/LexerToken.h"
 #include <vector>
+#include <cassert>
 
 namespace clang {
   class Preprocessor;