Mostly revert "[fuchsia] Prepare for setting the Dart target architecture appropriately in the host…

runtime/vm/BUILD.gn

Index: runtime/vm/BUILD.gn
diff --git a/runtime/vm/BUILD.gn b/runtime/vm/BUILD.gn
index 8b8108ee3dbb2a117c4b55520846c7fb24f6f247..3af9130a330bcd596c05a8e98bfac2216d645f94 100644
--- a/runtime/vm/BUILD.gn
+++ b/runtime/vm/BUILD.gn
@@ -49,7 +49,6 @@ static_library("libdart_vm_jit") {
   configs += [
     "..:dart_config",
     "..:dart_maybe_product_config",
-    "..:dart_use_target_arch_config",
   ]
   if (is_fuchsia) {
     configs -= [ "//build/config:symbol_visibility_hidden" ]
@@ -68,7 +67,6 @@ static_library("libdart_vm_precompiled_runtime") {
     "..:dart_config",
     "..:dart_maybe_product_config",
     "..:dart_precompiled_runtime_config",
-    "..:dart_use_target_arch_config",
   ]
   if (is_fuchsia) {
     configs -= [ "//build/config:symbol_visibility_hidden" ]
@@ -87,7 +85,6 @@ static_library("libdart_vm_nosnapshot") {
     "..:dart_config",
     "..:dart_maybe_product_config",
     "..:dart_no_snapshot_config",
-    "..:dart_use_target_arch_config",
   ]
   if (is_fuchsia) {
     configs -= [ "//build/config:symbol_visibility_hidden" ]
@@ -102,26 +99,6 @@ static_library("libdart_vm_nosnapshot") {
 }
 
 static_library("libdart_vm_nosnapshot_with_precompiler") {
-  configs += [
-    "..:dart_config",
-    "..:dart_maybe_product_config",
-    "..:dart_precompiler_config",
-    "..:dart_no_snapshot_config",
-    "..:dart_use_target_arch_config",
-  ]
-  if (is_fuchsia) {
-    configs -= [ "//build/config:symbol_visibility_hidden" ]
-  }
-  public_configs = [ ":libdart_vm_config" ]
-  set_sources_assignment_filter([
-                                  "*_test.cc",
-                                  "*_test.h",
-                                ])
-  sources = vm_sources_list
-  include_dirs = [ ".." ]
-}
-
-static_library("libdart_vm_nosnapshot_with_precompiler_host_arch") {
   configs += [
     "..:dart_config",
     "..:dart_maybe_product_config",
@@ -145,7 +122,6 @@ static_library("libdart_vm_with_precompiler") {
     "..:dart_config",
     "..:dart_maybe_product_config",
     "..:dart_precompiler_config",
-    "..:dart_use_target_arch_config",
   ]
   if (is_fuchsia) {
     configs -= [ "//build/config:symbol_visibility_hidden" ]
@@ -255,21 +231,6 @@ template("generate_core_libraries") {
   all_libsources = rebase_path(invoker.allsources, ".", "../lib")
 
   static_library("libdart_lib_nosnapshot_with_precompiler") {
-    configs += [
-      "..:dart_config",
-      "..:dart_maybe_product_config",
-      "..:dart_precompiler_config",
-      "..:dart_use_target_arch_config",
-    ]
-    if (is_fuchsia) {
-      configs -= [ "//build/config:symbol_visibility_hidden" ]
-    }
-    deps = libdeps
-    sources = all_libsources + [ "bootstrap.cc" ] + liboutputs
-    include_dirs = [ ".." ]
-  }
-
-  static_library("libdart_lib_nosnapshot_with_precompiler_host_arch") {
     configs += [
       "..:dart_config",
       "..:dart_maybe_product_config",
@@ -288,7 +249,6 @@ template("generate_core_libraries") {
       "..:dart_config",
       "..:dart_maybe_product_config",
       "..:dart_precompiler_config",
-      "..:dart_use_target_arch_config",
     ]
     if (is_fuchsia) {
       configs -= [ "//build/config:symbol_visibility_hidden" ]
@@ -302,7 +262,6 @@ template("generate_core_libraries") {
     configs += [
       "..:dart_config",
       "..:dart_maybe_product_config",
-      "..:dart_use_target_arch_config",
     ]
     if (is_fuchsia) {
       configs -= [ "//build/config:symbol_visibility_hidden" ]
@@ -316,7 +275,6 @@ template("generate_core_libraries") {
       "..:dart_config",
       "..:dart_maybe_product_config",
       "..:dart_precompiled_runtime_config",
-      "..:dart_use_target_arch_config",
     ]
     if (is_fuchsia) {
       configs -= [ "//build/config:symbol_visibility_hidden" ]