Add more instructions to text-based spec.

src/trusted/validator_ragel/testdata/64/bswap.test

 @hex:
   # Test handling of different sizes for instruction bswap.
-  # 32-bit example
   0f c8
-  # 64-bit example
-  48 0f c8
-  # Bad case, we should not parse 16-bit operands
-  66 0f c8
-  
 @dis:
      0: 0f c8                                           bswap  %eax
-     2: 48 0f c8                                        bswap  %rax
-     5: 66 0f c8                                        bswap  %ax
 @rdfa_output:
-  5: [0] unrecognized instruction
+  return code: 0
+@spec:
+  SAFE
+----------------------------------------------------------------------
+@hex:
+  48 0f c8
+@dis:
+     0: 48 0f c8                                        bswap  %rax
+@rdfa_output:
+  return code: 0
+@spec:
+  SAFE
+----------------------------------------------------------------------
+@hex:
+  # Bad case, we should not parse 16-bit operands 
+  # (because bswap's behavior is undefined)
+  66 0f c8
+@dis:
+     0: 66 0f c8                                        bswap  %ax
+@rdfa_output:
+  0: [0] unrecognized instruction
   return code: 1
+@spec:
+  0: ('bswap is only allowed with 32-bit and 64-bit operands', Instruction(0x0: 66 0f c8  bswap %ax))