[Fixed Point] [AST] Add an AST serialization code for fixed-point literals.

Summary:
This patch adds the EXPR_FIXEDPOINT_LITERAL AST
code to serialize FixedPointLiterals. They were previously
being serialized with the code for integer literals, which
doesn't work properly.

Reviewers: leonardchan, rjmccall

Reviewed By: leonardchan, rjmccall

Subscribers: vabridgers, JesperAntonsson, bjope, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D57226
diff --git a/clang/lib/Serialization/ASTWriter.cpp b/clang/lib/Serialization/ASTWriter.cpp
index 3b72f0f..6fb2357 100644
--- a/clang/lib/Serialization/ASTWriter.cpp
+++ b/clang/lib/Serialization/ASTWriter.cpp
@@ -571,6 +571,7 @@
   RECORD(EXPR_PREDEFINED);
   RECORD(EXPR_DECL_REF);
   RECORD(EXPR_INTEGER_LITERAL);
+  RECORD(EXPR_FIXEDPOINT_LITERAL);
   RECORD(EXPR_FLOATING_LITERAL);
   RECORD(EXPR_IMAGINARY_LITERAL);
   RECORD(EXPR_STRING_LITERAL);