Add extensionEnabled(Ext_V) guards for vector registers

Add missing guards for the vector CSRs and move the Ext_V definition to ensure compilation succeeds.

model/riscv_insts_vext_vset.sail

@@ -11,8 +11,6 @@
 /* Chapter 6: Configuration-Setting Instructions                                   */
 /* ******************************************************************************* */
 
-enum clause extension = Ext_V
-function clause extensionEnabled(Ext_V) = (misa[V] == 0b1) & (mstatus[VS] != 0b00)
 
 mapping sew_flag : string <-> bits(3) = {
   "e8"    <-> 0b000,

model/riscv_vext_control.sail

@@ -6,6 +6,9 @@
 /*  SPDX-License-Identifier: BSD-2-Clause                                                */
 /*=======================================================================================*/
 
+enum clause extension = Ext_V
+function clause extensionEnabled(Ext_V) = (misa[V] == 0b1) & (mstatus[VS] != 0b00)
+
 mapping clause csr_name_map = 0x008  <-> "vstart"
 mapping clause csr_name_map = 0x009  <-> "vxsat"
 mapping clause csr_name_map = 0x00A  <-> "vxrm"
@@ -14,13 +17,13 @@ mapping clause csr_name_map = 0xC20  <-> "vl"
 mapping clause csr_name_map = 0xC21  <-> "vtype"
 mapping clause csr_name_map = 0xC22  <-> "vlenb"
 
-function clause is_CSR_defined (0x008) = true
-function clause is_CSR_defined (0x009) = true
-function clause is_CSR_defined (0x00A) = true
-function clause is_CSR_defined (0x00F) = true
-function clause is_CSR_defined (0xC20) = true
-function clause is_CSR_defined (0xC21) = true
-function clause is_CSR_defined (0xC22) = true
+function clause is_CSR_defined (0x008) = extensionEnabled(Ext_V) // vstart
+function clause is_CSR_defined (0x009) = extensionEnabled(Ext_V) // vxsat
+function clause is_CSR_defined (0x00A) = extensionEnabled(Ext_V) // vxrm
+function clause is_CSR_defined (0x00F) = extensionEnabled(Ext_V) // vcsr
+function clause is_CSR_defined (0xC20) = extensionEnabled(Ext_V) // vl
+function clause is_CSR_defined (0xC21) = extensionEnabled(Ext_V) // vtype
+function clause is_CSR_defined (0xC22) = extensionEnabled(Ext_V) // vlenb
 
 function clause read_CSR(0x008) = zero_extend(vstart)
 function clause read_CSR(0x009) = zero_extend(vcsr[vxsat])