[clang-doc] Bump BitcodeWriter max line number to 32U

PR43039 reports hitting the assert on a very large file, so bumping this
to allow for larger files.

Differential Revision: https://reviews.llvm.org/D66681

git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@369811 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/clang-doc/BitcodeWriter.h b/clang-doc/BitcodeWriter.h
index 8865da3..7deda2e 100644
--- a/clang-doc/BitcodeWriter.h
+++ b/clang-doc/BitcodeWriter.h
@@ -40,7 +40,7 @@
   static constexpr unsigned IntSize = 16U;
   static constexpr unsigned StringLengthSize = 16U;
   static constexpr unsigned FilenameLengthSize = 16U;
-  static constexpr unsigned LineNumberSize = 16U;
+  static constexpr unsigned LineNumberSize = 32U;
   static constexpr unsigned ReferenceTypeSize = 8U;
   static constexpr unsigned USRLengthSize = 6U;
   static constexpr unsigned USRBitLengthSize = 8U;