[fuchsia] Prepare for setting the Dart target architecture appropriately in the host binaries.

runtime/vm/BUILD.gn

Index: runtime/vm/BUILD.gn
diff --git a/runtime/vm/BUILD.gn b/runtime/vm/BUILD.gn
index 34f1c89f20afc75efac2d3fe2c358befc3b91e62..0c16e3cabac2f498d990eac35f946614f71deb64 100644
--- a/runtime/vm/BUILD.gn
+++ b/runtime/vm/BUILD.gn
@@ -46,6 +46,7 @@ static_library("libdart_vm_jit") {
   configs += [
     "..:dart_config",
     "..:dart_maybe_product_config",
+    "..:dart_use_target_arch_config",
   ]
   public_configs = [ ":libdart_vm_config" ]
   set_sources_assignment_filter([
@@ -61,6 +62,7 @@ static_library("libdart_vm_precompiled_runtime") {
     "..:dart_config",
     "..:dart_maybe_product_config",
     "..:dart_precompiled_runtime_config",
+    "..:dart_use_target_arch_config",
   ]
   public_configs = [ ":libdart_vm_config" ]
   set_sources_assignment_filter([
@@ -76,6 +78,7 @@ static_library("libdart_vm_nosnapshot") {
     "..:dart_config",
     "..:dart_maybe_product_config",
     "..:dart_no_snapshot_config",
+    "..:dart_use_target_arch_config",
   ]
   public_configs = [ ":libdart_vm_config" ]
   set_sources_assignment_filter([
@@ -87,6 +90,23 @@ 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",
+  ]
+  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",
@@ -107,6 +127,7 @@ static_library("libdart_vm_with_precompiler") {
     "..:dart_config",
     "..:dart_maybe_product_config",
     "..:dart_precompiler_config",
+    "..:dart_use_target_arch_config",
   ]
   public_configs = [ ":libdart_vm_config" ]
   set_sources_assignment_filter([
@@ -213,6 +234,18 @@ 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",
+    ]
+    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",
@@ -228,6 +261,7 @@ template("generate_core_libraries") {
       "..:dart_config",
       "..:dart_maybe_product_config",
       "..:dart_precompiler_config",
+      "..:dart_use_target_arch_config",
     ]
     deps = libdeps
     sources = all_libsources + [ "bootstrap_nocore.cc" ]
@@ -238,6 +272,7 @@ template("generate_core_libraries") {
     configs += [
       "..:dart_config",
       "..:dart_maybe_product_config",
+      "..:dart_use_target_arch_config",
     ]
     sources = all_libsources + [ "bootstrap_nocore.cc" ]
     include_dirs = [ ".." ]
@@ -248,6 +283,7 @@ template("generate_core_libraries") {
       "..:dart_config",
       "..:dart_maybe_product_config",
       "..:dart_precompiled_runtime_config",
+      "..:dart_use_target_arch_config",
     ]
     sources = all_libsources + [ "bootstrap_nocore.cc" ]
     include_dirs = [ ".." ]