Move boolean indicating hardware SVE support to separate file

PiperOrigin-RevId: 677958227

util/BUILD

@@ -1179,7 +1179,7 @@ cc_library_plus_nolibc(
             "@silifuzz//build_defs/platform:aarch64": [
                 "aarch64/reg_group_io_buffer_offsets.h",
                 "aarch64/reg_groups.cc",
-                "aarch64/save_register_groups_to_buffer.S",
+                "aarch64/sve_supported.S",
             ],
             "@silifuzz//build_defs/platform:x86_64": ["x86_64/reg_groups.cc"],
         }),
@@ -1220,6 +1220,7 @@ cc_library_plus_nolibc(
             "aarch64/reg_group_io.cc",
             "aarch64/reg_group_io_buffer_offsets.h",
             "aarch64/save_register_groups_to_buffer.S",
+            "aarch64/sve_supported.S",
         ],
         "@silifuzz//build_defs/platform:x86_64": [
             "x86_64/reg_group_io.cc",

util/aarch64/save_register_groups_to_buffer.S

@@ -61,14 +61,3 @@ Exit:
         ldp     x19, x30, [sp], #16
         ret
         .size   SaveRegisterGroupsToBuffer, .-SaveRegisterGroupsToBuffer
-
-        .bss
-// Flag to tell if SVE is supported.
-        .align  1
-        .globl  reg_group_io_supports_sve
-        .type   reg_group_io_supports_sve, @object
-        .size   reg_group_io_supports_sve, 1
-reg_group_io_supports_sve:
-        .zero   1
-
-        .section        .note.GNU-stack,"",@progbits

util/aarch64/sve_supported.S

@@ -0,0 +1,22 @@
+// Copyright 2024 The SiliFuzz Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+        .bss
+// Flag to tell if SVE is supported.
+        .align  1
+        .globl  reg_group_io_supports_sve
+        .type   reg_group_io_supports_sve, @object
+        .size   reg_group_io_supports_sve, 1
+reg_group_io_supports_sve:
+        .zero   1