[AArch64] Follow-up to: Refactor AArch64NamedImmMapper to become dependent on subtarget features
[AArch64] Follow-up to: Refactor AArch64NamedImmMapper to become dependent on subtarget features

Fixed compilation with clang on some buildbots with "-Werror -Wmissing-field-initializers"

Related to: http://reviews.llvm.org/rL235089


git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@235099 91177308-0d34-0410-b5e6-96231b3b80d8

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