[GlobalIsel] Fix Machine Verifier errors (#99018)

temporary solution.
For discussion see #98894

Permanent solution could be:
REQUIRES: default_triple

Author: Thorsten Schütt

llvm/test/MachineVerifier/test_g_extract_subvector.mir

@@ -1,4 +1,5 @@
-# RUN: not --crash llc -o - -run-pass=none -verify-machineinstrs %s 2>&1 | FileCheck %s
+# RUN: not --crash llc -o - -run-pass=none -verify-machineinstrs -mtriple=arm64 %s 2>&1 | FileCheck %s
+# REQUIRES: aarch64-registered-target
 ---
 name:            g_extract_subvector
 tracksRegLiveness: true

llvm/test/MachineVerifier/test_g_insert_subvector.mir

@@ -1,4 +1,5 @@
-# RUN: not --crash llc -o - -run-pass=none -verify-machineinstrs %s 2>&1 | FileCheck %s
+# RUN: not --crash llc -o - -run-pass=none -verify-machineinstrs -mtriple=arm64 %s 2>&1 | FileCheck %s
+# REQUIRES: aarch64-registered-target
 
 ---
 name:            g_splat_vector

llvm/test/MachineVerifier/test_g_vscale.mir

@@ -1,4 +1,5 @@
-# RUN: not --crash llc -verify-machineinstrs -run-pass none -o /dev/null %s 2>&1 | FileCheck %s
+# RUN: not --crash llc -verify-machineinstrs -mtriple=arm64 -run-pass none -o /dev/null %s 2>&1 | FileCheck %s
+# REQUIRES: aarch64-registered-target
 
 ---
 name:            g_vscale