PR4283: Don't truncate multibyte character constants in the 
preprocessor.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@72686 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Lex/LiteralSupport.cpp b/lib/Lex/LiteralSupport.cpp
index 398082f..0324c0b 100644
--- a/lib/Lex/LiteralSupport.cpp
+++ b/lib/Lex/LiteralSupport.cpp
@@ -680,6 +680,7 @@
       PP.Diag(Loc, diag::ext_multichar_character_literal);
     else
       PP.Diag(Loc, diag::ext_four_char_character_literal);
+    IsMultiChar = true;
   }
 
   // Transfer the value from APInt to uint64_t