[PATCH] MIR Serialization: Serialize the bitmask target flags.

[Alex L via llvm-commits]

Hello,

This patch extends the serialization for the machine operand target flags by
serializing the bit mask target flags. The target flags now use the
following
syntax:

   target-flags(<direct-flag>)
   target-flags([ <direct-flag> , ] <bitmask-flags>)

Example:

   target-flags(aarch64-pageoff, aarch64-got, aarch64-nc)

This patch also adds support for target flag serialization for the AArch64
target.

Thanks,
Alex
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