[gn build] Port cbc9c4e

Author: llvmgnsyncbot

llvm/utils/gn/secondary/clang-tools-extra/clangd/BUILD.gn

@@ -97,6 +97,7 @@ static_library("clangd") {
     "HeuristicResolver.cpp",
     "Hover.cpp",
     "IncludeFixer.cpp",
+    "InlayHints.cpp",
     "JSONTransport.cpp",
     "ParsedAST.cpp",
     "PathMapping.cpp",

llvm/utils/gn/secondary/clang-tools-extra/clangd/unittests/BUILD.gn

@@ -78,6 +78,7 @@ unittest("ClangdTests") {
     "HoverTests.cpp",
     "IndexActionTests.cpp",
     "IndexTests.cpp",
+    "InlayHintTests.cpp",
     "JSONTransportTests.cpp",
     "LSPBinderTests.cpp",
     "LSPClient.cpp",