Delete old x86 validator.

src/trusted/validator/x86/decoder/ncop_expr_node_flag.enum

-# The set of possible flags associated with expr nodes.
-# Each line defines a separate type of expr node.
-
-# Defines that a set occurs for this subexpression.
-ExprSet
-# Defines that a use occurs for this subexpression.
-ExprUsed
-# Defines that an address is computed by the subexpression.
-ExprAddress
-# Defines that the size of the data is 1 byte.
-ExprSize8
-# Defines that the size of the data is 2 bytes.
-ExprSize16
-# Defines that the size of the data is 4 bytes.
-ExprSize32
-# Defines that the size of the data is 6 bytes.
-ExprSize48
-# Defines that the size of the data is 8 bytes.
-ExprSize64
-# Defines that the constant is an unsigned hex value instead of an integer.
-ExprUnsignedHex
-# Defines that the constant is a signed hexidecimal value instead of
-# an integer.
-ExprSignedHex
-# Defines that the constant is an unsigned integer instead of a hex value.
-ExprUnsignedInt
-# Defines that the constant is a signed integer instead of a hex value.
-ExprSignedInt
-# Defines an implicit argument that shouldn't be printed.
-ExprImplicit
-# Defines that the corresponding constant is a jump target.
-ExprJumpTarget
-# Defines that we have special case of segment register that should
-# be printed in the segment address, even if the operand is implicit,
-# which happens for instances of DS:[r].
-ExprDSrCase
-# Defines that we have special case of segment register that should
-# be printed in the segment address, even if the operand is implicit,
-# which happens for instances of ES:[r].
-ExprESrCase