Delete old x86 validator.

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

-@hex:
-  # Show an example of a valid (implicit) reference to a segment register.
-  #   mov %edi, %edi
-  #   lea %rdi, [%r15+%rdi*1]
-  #   stosd
-  89 ff \\
-  49 8d 3c 3f \\
-  ab
-@val:
-  VALIDATOR: Checking jump targets: 0 to 7
-  VALIDATOR: Checking that basic blocks are aligned
-  *** <input> is safe ***
-@rval:
-  VALIDATOR: Checking jump targets: 0 to 7
-  VALIDATOR: Checking that basic blocks are aligned
-  *** <input> is safe ***
-@rvald:
-  VALIDATOR: Checking block alignment and jump targets: 0 to 7
-  *** <input> is safe ***
-@vd-rval:
-  VALIDATOR: Checking jump targets: 0 to 7
-  VALIDATOR: Checking that basic blocks are aligned
-  *** <input> is safe ***
-@dis:
-  0000000000000000: 89 ff                                        mov %edi, %edi
-  0000000000000002: 49 8d 3c 3f                                  lea %rdi, [%r15+%rdi*1]
-  0000000000000006: ab                                           stosd [%rdi]
-@vdis:
-  0000000000000000: 89 ff                                        mov %edi, %edi
-  0000000000000002: 49 8d 3c 3f                                  lea %rdi, [%r15+%rdi*1]
-  0000000000000006: ab                                           [P] dontcare [%rdi] (s), %eax (u)
-@rdfa_output:
-  return code: 0