Delete old x86 validator.

src/trusted/validator_x86/testdata/64/bsr-mask.test

-@hex:
-  # Test if we disallow bsr to zero-extend (i.e. mask) a memory reference.
-  0f bd c3
-  49 89 14 07
-@rval:
-  VALIDATOR: 0000000000000003: 49 89 14 07                                  mov [%r15+%rax*1], %rdx
-  VALIDATOR: ERROR: Invalid index register in memory offset
-  VALIDATOR: Checking jump targets: 0 to 7
-  VALIDATOR: Checking that basic blocks are aligned
-  *** <input> IS UNSAFE ***
-@rvald:
-  VALIDATOR: 0000000000000003: 49 89 14 07                                  mov [%r15+%rax*1], %rdx
-  VALIDATOR: ERROR: Invalid index register in memory offset
-  VALIDATOR: Checking block alignment and jump targets: 0 to 7
-  *** <input> IS UNSAFE ***
-@vd-rval:
-  VALIDATOR: 0000000000000003: 49 89 14 07                                  mov [%r15+%rax*1], %rdx
-  VALIDATOR: ERROR: Invalid index register in memory offset
-  VALIDATOR: Checking jump targets: 0 to 7
-  VALIDATOR: Checking that basic blocks are aligned
-  *** <input> IS UNSAFE ***
-@dis:
-  0000000000000000: 0f bd c3                                     bsr %eax, %ebx
-  0000000000000003: 49 89 14 07                                  mov [%r15+%rax*1], %rdx
-@vdis:
-  0000000000000000: 0f bd c3                                     [P] dontcare %eax (s), %ebx (u)
-  0000000000000003: 49 89 14 07                                  mov [%r15+%rax*1], %rdx
-@rdfa_output:
-  3: [0] improper memory address - bad index
-  return code: 1