[gn build] Port 7a8f5d9

Author: llvmgnsyncbot

llvm/utils/gn/secondary/clang-tools-extra/clang-tidy/readability/BUILD.gn

@@ -47,6 +47,7 @@ static_library("readability") {
     "RedundantControlFlowCheck.cpp",
     "RedundantDeclarationCheck.cpp",
     "RedundantFunctionPtrDereferenceCheck.cpp",
+    "RedundantInlineSpecifierCheck.cpp",
     "RedundantMemberInitCheck.cpp",
     "RedundantPreprocessorCheck.cpp",
     "RedundantSmartptrGetCheck.cpp",