Delete old x86 validator.

src/trusted/validator_x86/testdata/64/push.test

-@hex:
-  # Tests that push operand sizes work correctly.
-  
-  # The following tests the default size (which is 4 bytes).
-  68 03 04 05 06
-  
-  # The following tests that rex.w doesn't effect the size.
-  48 68 03 04 05 06
-  
-  # The following tests that data66 defines the size as 2 bytes.
-  66 68 03 04
-  
-  # The following shows that we don't allow rex.w and a data 66 prefix.
-  66 48 68 03 04
-  
-  90 90 90 90
-@rval:
-  VALIDATOR: 000000000000000f: 66 48 68                                     invalid
-  VALIDATOR: ERROR: Opcode sequence doesn't define a valid x86 instruction
-  VALIDATOR: 000000000000000f: 66 48 68                                     invalid
-  VALIDATOR: ERROR: Use of DATA16 (66) prefix for instruction not allowed by Native Client
-  VALIDATOR: 0000000000000012: 03 04 90                                     add %eax, [%rax+%rdx*4]
-  VALIDATOR: ERROR: Invalid base register in memory offset
-  VALIDATOR: Checking jump targets: 0 to 18
-  VALIDATOR: Checking that basic blocks are aligned
-  *** <input> IS UNSAFE ***
-@dis:
-  0000000000000000: 68 03 04 05 06                               push 0x6050403
-  0000000000000005: 48 68 03 04 05 06                            push 0x6050403
-  000000000000000b: 66 68 03 04                                  push 0x403
-  000000000000000f: 66 48 68                                     invalid
-  0000000000000012: 03 04 90                                     add %eax, [%rax+%rdx*4]
-  0000000000000015: 90                                           nop
-  0000000000000016: 90                                           nop
-  0000000000000017: 90                                           nop
-@rdfa_output:
-  f: [0] unrecognized instruction
-  return code: 1
-@validators_disagree:
-  errors reported by old validator but not by rdfa one:
-    0x12 - old validators recovers in the middle of invalid instruction