[gn build] Port 89aad1e

Author: llvmgnsyncbot

llvm/utils/gn/secondary/clang/lib/Format/BUILD.gn

@@ -16,6 +16,7 @@ static_library("Format") {
     "Format.cpp",
     "FormatToken.cpp",
     "FormatTokenLexer.cpp",
+    "IntegerLiteralSeparatorFixer.cpp",
     "MacroCallReconstructor.cpp",
     "MacroExpander.cpp",
     "NamespaceEndCommentsFixer.cpp",

llvm/utils/gn/secondary/clang/unittests/Format/BUILD.gn

@@ -29,6 +29,7 @@ unittest("FormatTests") {
     "FormatTestTableGen.cpp",
     "FormatTestTextProto.cpp",
     "FormatTestVerilog.cpp",
+    "IntegerLiteralSeparatorTest.cpp",
     "MacroCallReconstructorTest.cpp",
     "MacroExpanderTest.cpp",
     "NamespaceEndCommentsFixerTest.cpp",