Extract hypervisor_exceptions variable

Which I will reuse next.

riscv/processor.cc

@@ -872,6 +872,13 @@ void processor_t::set_csr(int which, reg_t val)
   reg_t coprocessor_ints = (!custom_extensions.empty()) << IRQ_COP;
   reg_t delegable_ints = supervisor_ints | coprocessor_ints;
   reg_t all_ints = delegable_ints | hypervisor_ints | MIP_MSIP | MIP_MTIP | MIP_MEIP;
+  reg_t hypervisor_exceptions = 0
+    | (1 << CAUSE_VIRTUAL_SUPERVISOR_ECALL)
+    | (1 << CAUSE_FETCH_GUEST_PAGE_FAULT)
+    | (1 << CAUSE_LOAD_GUEST_PAGE_FAULT)
+    | (1 << CAUSE_VIRTUAL_INSTRUCTION)
+    | (1 << CAUSE_STORE_GUEST_PAGE_FAULT)
+    ;
 
   if (which >= CSR_PMPADDR0 && which < CSR_PMPADDR0 + state.max_pmp) {
     // If no PMPs are configured, disallow access to all.  Otherwise, allow
@@ -1001,13 +1008,7 @@ void processor_t::set_csr(int which, reg_t val)
         (1 << CAUSE_FETCH_PAGE_FAULT) |
         (1 << CAUSE_LOAD_PAGE_FAULT) |
         (1 << CAUSE_STORE_PAGE_FAULT);
-      mask |= supports_extension('H') ?
-        (1 << CAUSE_VIRTUAL_SUPERVISOR_ECALL) |
-        (1 << CAUSE_FETCH_GUEST_PAGE_FAULT) |
-        (1 << CAUSE_LOAD_GUEST_PAGE_FAULT) |
-        (1 << CAUSE_VIRTUAL_INSTRUCTION) |
-        (1 << CAUSE_STORE_GUEST_PAGE_FAULT)
-        : 0;
+      mask |= supports_extension('H') ? hypervisor_exceptions : 0;
       state.medeleg = (state.medeleg & ~mask) | (val & mask);
       break;
     }