[NFC] Minor update to comment

Update comment after rLLDB339994

Differential Revision: https://reviews.llvm.org/D49980

llvm-svn: 340151
diff --git a/lldb/source/Symbol/ClangASTContext.cpp b/lldb/source/Symbol/ClangASTContext.cpp
index 7f617dc..d553b19 100644
--- a/lldb/source/Symbol/ClangASTContext.cpp
+++ b/lldb/source/Symbol/ClangASTContext.cpp
@@ -6738,7 +6738,7 @@
                   }
                 }
 
-                // Setting this to UINT32_MAX to make sure we don't compute it
+                // Setting this to INT32_MAX to make sure we don't compute it
                 // twice...
                 bit_offset = INT32_MAX;