gn build: Merge r363626.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@363634 91177308-0d34-0410-b5e6-96231b3b80d8

Author: pcc

utils/gn/secondary/clang/lib/Frontend/BUILD.gn

@@ -36,6 +36,7 @@ static_library("Frontend") {
     "HeaderIncludeGen.cpp",
     "InitHeaderSearch.cpp",
     "InitPreprocessor.cpp",
+    "InterfaceStubFunctionsConsumer.cpp",
     "LangStandards.cpp",
     "LayoutOverrideSource.cpp",
     "LogDiagnosticPrinter.cpp",