RISC-V: Reorder CSR classes related to 'Ssstateen'

This is a generic tidying commit to fix a minor ordering issue on commit
1525331 ("RISC-V: Add 'Ssstateen' extension and its CSRs").

gas/ChangeLog:

	* config/tc-riscv.c (enum riscv_csr_class): Reorder 'Ssstateen'-
	related CSR classes.
	(riscv_csr_address): Likewise.

Author: a4lg

gas/config/tc-riscv.c

@@ -80,11 +80,11 @@ enum riscv_csr_class
   CSR_CLASS_SSAIA_AND_H,	/* Ssaia with H */
   CSR_CLASS_SSAIA_32,		/* Ssaia, rv32 only */
   CSR_CLASS_SSAIA_AND_H_32,	/* Ssaia with H, rv32 only */
+  CSR_CLASS_SSCOFPMF,		/* Sscofpmf only */
+  CSR_CLASS_SSCOFPMF_32,	/* Sscofpmf RV32 only */
   CSR_CLASS_SSSTATEEN,		/* S[ms]stateen only */
   CSR_CLASS_SSSTATEEN_AND_H,	/* S[ms]stateen only (with H) */
   CSR_CLASS_SSSTATEEN_AND_H_32,	/* S[ms]stateen RV32 only (with H) */
-  CSR_CLASS_SSCOFPMF,		/* Sscofpmf only */
-  CSR_CLASS_SSCOFPMF_32,	/* Sscofpmf RV32 only */
   CSR_CLASS_SSTC,		/* Sstc only */
   CSR_CLASS_SSTC_AND_H,		/* Sstc only (with H) */
   CSR_CLASS_SSTC_32,		/* Sstc RV32 only */
@@ -1065,6 +1065,12 @@ riscv_csr_address (const char *csr_name,
 		       || csr_class == CSR_CLASS_SSAIA_AND_H_32);
       extension = "ssaia";
       break;
+    case CSR_CLASS_SSCOFPMF_32:
+      is_rv32_only = true;
+      /* Fall through.  */
+    case CSR_CLASS_SSCOFPMF:
+      extension = "sscofpmf";
+      break;
     case CSR_CLASS_SSSTATEEN_AND_H_32:
       is_rv32_only = true;
       /* Fall through.  */
@@ -1074,12 +1080,6 @@ riscv_csr_address (const char *csr_name,
     case CSR_CLASS_SSSTATEEN:
       extension = "ssstateen";
       break;
-    case CSR_CLASS_SSCOFPMF_32:
-      is_rv32_only = true;
-      /* Fall through.  */
-    case CSR_CLASS_SSCOFPMF:
-      extension = "sscofpmf";
-      break;
     case CSR_CLASS_SSTC:
     case CSR_CLASS_SSTC_AND_H:
     case CSR_CLASS_SSTC_32: