[BOLT] Gate PointerAuthCFIFixup unit test on AArch64 target availability (#197464) The test bodies reference AArch64:: namespace identifiers (ADDSXri, X0) which fail to compile when AArch64 is not in LLVM_TARGETS_TO_BUILD. Wrap all TEST_P bodies in #ifdef AARCH64_AVAILABLE and add GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST to suppress GoogleTest's uninstantiated suite error when no target instantiates the tests.
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