gn build: Fix clang-tidy dep on ClangSACheckers.

[mbonadei]

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

7

This turned out to be easier than I thought. You've already done everything in https://reviews.llvm.org/D55927. :)

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

 import("//clang/lib/StaticAnalyzer/Frontend/enable.gni")
 
 static_library("clang-tidy") {
   output_name = "clangTidy"
   configs += [ "//llvm/utils/gn/build:clang_code" ]
   deps = [
+    "//clang/include/clang/StaticAnalyzer/Checkers",
     "//clang/lib/AST",
     "//clang/lib/ASTMatchers",
     "//clang/lib/Basic",
     "//clang/lib/Format",
     "//clang/lib/Frontend",
     "//clang/lib/Lex",
     "//clang/lib/Rewrite",
     "//clang/lib/Sema",
     "//clang/lib/Serialization",
     "//clang/lib/Tooling",
     "//clang/lib/Tooling/Core",
     "//llvm/lib/Support",
-
-    # TODO(mbonadei): Add support for Clang Static Analyzer checkers.
-    # Without this, "clang-analyzer-" will not work.
-    # ClangSACheckers
   ]
 
   if (clang_enable_static_analyzer) {
     deps += [
       "//clang/lib/StaticAnalyzer/Core",
       "//clang/lib/StaticAnalyzer/Frontend",
     ]
   }