Fix build when ICU is not available.

Change-Id: Iabb9e75b62f13a3bd08114941880c1d4a7f74d8c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1687278
Commit-Queue: Yang Guo <yangguo@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62613}

BUILD.gn

@@ -3879,48 +3879,51 @@ v8_executable("torque-language-server") {
   }
 }
 
-if (current_toolchain == v8_generator_toolchain) {
-  v8_executable("gen-regexp-special-case") {
-    visibility = [ ":*" ]  # Only targets in this file can depend on this.
+if (v8_enable_i18n_support) {
+  if (current_toolchain == v8_generator_toolchain) {
+    v8_executable("gen-regexp-special-case") {
+      visibility = [ ":*" ]  # Only targets in this file can depend on this.
 
-    sources = [
-      "src/regexp/gen-regexp-special-case.cc",
-    ]
+      sources = [
+        "src/regexp/gen-regexp-special-case.cc",
+      ]
 
-    deps = [
-      ":v8_libbase",
-      "//build/win:default_exe_manifest",
-      "//third_party/icu",
-    ]
+      deps = [
+        ":v8_libbase",
+        "//build/win:default_exe_manifest",
+        "//third_party/icu",
+      ]
 
-    configs = [ ":internal_config" ]
+      configs = [ ":internal_config" ]
+    }
   }
-}
 
-action("run_gen-regexp-special-case") {
-  visibility = [ ":*" ]  # Only targets in this file can depend on this.
+  action("run_gen-regexp-special-case") {
+    visibility = [ ":*" ]  # Only targets in this file can depend on this.
 
-  script = "tools/run.py"
+    script = "tools/run.py"
 
-  sources = v8_extra_library_files
+    sources = v8_extra_library_files
 
-  deps = [
-    ":gen-regexp-special-case($v8_generator_toolchain)",
-  ]
+    deps = [
+      ":gen-regexp-special-case($v8_generator_toolchain)",
+    ]
 
-  output_file = "$target_gen_dir/src/regexp/special-case.cc"
+    output_file = "$target_gen_dir/src/regexp/special-case.cc"
 
-  outputs = [
-    output_file,
-  ]
+    outputs = [
+      output_file,
+    ]
 
-  args = [
-    "./" + rebase_path(
-            get_label_info(":gen-regexp-special-case($v8_generator_toolchain)",
-                           "root_out_dir") + "/gen-regexp-special-case",
-            root_build_dir),
-    rebase_path(output_file, root_build_dir),
-  ]
+    args = [
+      "./" + rebase_path(
+              get_label_info(
+                      ":gen-regexp-special-case($v8_generator_toolchain)",
+                      "root_out_dir") + "/gen-regexp-special-case",
+              root_build_dir),
+      rebase_path(output_file, root_build_dir),
+    ]
+  }
 }
 
 ###############################################################################