[Assembler][x64] Make Operand immutable
This CL removes all setters from the Operand and removes the friendship relation between Assembler and Operand. All data fields of the Operand are set exactly once in the constructor, the Operand is immutable afterwards. In order to construct the data of an Operand easily, the OperandBuilder is introduced. After building an Operand, the data is copied to the const field of the Operand. R=mstarzinger@chromium.org Bug: v8:7310 Change-Id: I1628052b8a0c47cbfbc3645dfdac5a0e9705977b Reviewed-on: https://chromium-review.googlesource.com/936741Reviewed-by: Michael Starzinger <mstarzinger@chromium.org> Commit-Queue: Clemens Hammacher <clemensh@chromium.org> Cr-Commit-Position: refs/heads/master@{#51563}
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