[gn] Fix clang-tidy build

[mbonadei]

Summary

Not depending on clang/lib/StaticAnalyzer/Core and clang/lib/StaticAnalyzer/Frontend causes a linker error even if ClangSACheckers are not supported.

Undefined symbols for architecture x86_64:

"clang::ento::CreateAnalysisConsumer(clang::CompilerInstance&)", referenced from:
    clang::tidy::ClangTidyASTConsumerFactory::CreateASTConsumer(clang::CompilerInstance&, llvm::StringRef) in libclangTidy.a(libclangTidy.ClangTidy.o)

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

deps = [
     "//clang/lib/Tooling/Core",
     "//llvm/lib/Support",
 
     # TODO(mbonadei): Add support for Clang Static Analyzer checkers.
     # Without this, "clang-analyzer-" will not work.
     # ClangSACheckers
   ]
 
-  # TODO(mbonadei): Add support for Clang Static Analyzer checkers.
-  # Without this, "clang-analyzer-" will not work.
-  # if (clang_enable_static_analyzer) {
-  #   deps += [
-  #     "//clang/lib/StaticAnalyzer/Core",
-  #     "//clang/lib/StaticAnalyzer/Frontend",
-  #   ]
-  # }
+  if (clang_enable_static_analyzer) {
+    deps += [
+      "//clang/lib/StaticAnalyzer/Core",
+      "//clang/lib/StaticAnalyzer/Frontend",
+    ]
+  }
 
   sources = [
     "ClangTidy.cpp",
     "ClangTidyDiagnosticConsumer.cpp",
     "ClangTidyModule.cpp",
     "ClangTidyOptions.cpp",
     "ClangTidyProfiling.cpp",
   ]
 }