GN Build fixes for Flutter + gen_snapshot fix

runtime/vm/BUILD.gn

 # Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 config("libdart_vm_config") {
   libs = [
     "dl",
   ]
 
   if (!is_android) {
@@ skipping 43 matching lines @@
                                 ["vm_sources.gypi"])
 
   set_sources_assignment_filter(["*_test.cc", "*_test.h"])
   sources = vm_sources_list.sources
   include_dirs = [
     "..",
   ]
 }
 
 
-static_library("libdart_vm_precompiled_runtime") {
-  configs += ["..:dart_config_no_precompiler"]
-  public_configs = [":libdart_vm_config"]
-  defines = ["DART_PRECOMPILED_RUNTIME"]
-  vm_sources_list = exec_script("../../tools/gypi_to_gn.py",
-                                [rebase_path("vm_sources.gypi")],
-                                "scope",
-                                ["vm_sources.gypi"])
-
-  set_sources_assignment_filter(["*_test.cc", "*_test.h"])
-  sources = vm_sources_list.sources
-  include_dirs = [
-    "..",
-  ]
-}
-
-
 static_library("libdart_vm_nosnapshot") {
   configs += ["..:dart_config"]
   public_configs = [":libdart_vm_config"]
   defines = [ "DART_NO_SNAPSHOT" ]
   vm_sources_list = exec_script("../../tools/gypi_to_gn.py",
                                 [rebase_path("vm_sources.gypi")],
                                 "scope",
                                 ["vm_sources.gypi"])
 
   set_sources_assignment_filter(["*_test.cc", "*_test.h"])
@@ skipping 101 matching lines @@
       "..",
     ]
   }
   static_library("libdart_lib") {
     configs += ["..:dart_config"]
     sources = libsources + [ "bootstrap_nocore.cc", ]
     include_dirs = [
       "..",
     ]
   }
-  static_library("libdart_lib_precompiled_runtime") {
-    configs += ["..:dart_config_no_precompiler"]
-    defines = ["DART_PRECOMPILED_RUNTIME"]
-    sources = libsources + [ "bootstrap_nocore.cc", ]
-    include_dirs = [
-      "..",
-    ]
-  }
 }
 
 
 generate_core_libraries("core_libraries") {
   sources = [
     ["async", "async", true, "../../sdk/lib/async", "../lib"],
     ["core", "core", true, "../../sdk/lib/core", "../lib"],
     ["collection", "collection", true, "../../sdk/lib/collection", "../lib"],
     ["convert", "convert", true, "../../sdk/lib/convert", "../lib"],
     ["developer", "developer", true, "../../sdk/lib/developer", "../lib"],
     ["_internal", "internal", true, "../../sdk/lib/internal", "../lib"],
     ["isolate", "isolate", true, "../../sdk/lib/isolate", "../lib"],
     ["math", "math", true, "../../sdk/lib/math", "../lib"],
     ["mirrors", "mirrors", true, "../../sdk/lib/mirrors", "../lib"],
     ["profiler", "profiler", false, "../../sdk/lib/profiler"],
     ["typed_data", "typed_data", false, "../lib"],
     ["_vmservice", "vmservice", true, "../../sdk/lib/vmservice", "../lib"],
   ]
 }