Stop using get_fbobjc_enable_exception_lang_compiler_flags_DEPRECATED…

… in xplat

Summary:
Old deprecated function.

Changelog: [Internal]

Reviewed By: nlutsenko

Differential Revision: D20148856

fbshipit-source-id: 79d6fb97824b059e50f67ff5a0b4c38ec7a19469

React/CoreModules/BUCK

@@ -1,4 +1,4 @@
-load("@fbsource//tools/build_defs/apple:flag_defs.bzl", "OBJC_ARC_PREPROCESSOR_FLAGS", "get_fbobjc_enable_exception_lang_compiler_flags_DEPRECATED", "get_preprocessor_flags_for_build_mode")
+load("@fbsource//tools/build_defs/apple:flag_defs.bzl", "OBJC_ARC_PREPROCESSOR_FLAGS", "get_preprocessor_flags_for_build_mode")
 load("@fbsource//tools/build_defs/oss:rn_defs.bzl", "rn_apple_library", "rn_extra_build_flags")
 load(
     "@fbsource//xplat/configurations/buck/apple/plugins/sad_xplat_hosted_configurations:react_module_registration.bzl",
@@ -19,6 +19,7 @@ rn_apple_library(
         "-Wno-unknown-warning-option",
     ],
     contacts = ["oncall+react_native@xmail.facebook.com"],
+    enable_exceptions = True,
     exported_linker_flags = [
         "-weak_framework",
         "UserNotifications",
@@ -33,7 +34,6 @@ rn_apple_library(
     ],
     header_path_prefix = "React",
     labels = ["supermodule:ios/default/public.react_native.infra"],
-    lang_compiler_flags = get_fbobjc_enable_exception_lang_compiler_flags_DEPRECATED(),
     link_whole = True,
     platform_preprocessor_flags = [(
         "linux",