Revert "JBR-8038 8345296: AArch64: VM crashes with SIGILL when prctl is disallowed"

This reverts commit 8b0b738.

Author: vprovodin

src/hotspot/cpu/aarch64/vm_version_aarch64.cpp

@@ -440,19 +440,7 @@ void VM_Version::initialize() {
   }
 
   if (UseSVE > 0) {
-    int vl = get_current_sve_vector_length();
-    if (vl < 0) {
-      warning("Unable to get SVE vector length on this system. "
-              "Disabling SVE. Specify -XX:UseSVE=0 to shun this warning.");
-      FLAG_SET_DEFAULT(UseSVE, 0);
-    } else if ((vl == 0) || ((vl % FloatRegister::sve_vl_min) != 0) || !is_power_of_2(vl)) {
-      warning("Detected SVE vector length (%d) should be a power of two and a multiple of %d. "
-              "Disabling SVE. Specify -XX:UseSVE=0 to shun this warning.",
-              vl, FloatRegister::sve_vl_min);
-      FLAG_SET_DEFAULT(UseSVE, 0);
-    } else {
-      _initial_sve_vector_length = vl;
-    }
+    _initial_sve_vector_length = get_current_sve_vector_length();
   }
 
   // This machine allows unaligned memory accesses