[AArch64][2/4] Make LD testcases support ILP32 mode

[Jiong Wang]

This patch fixed most of LD testcases for ILP32 mode.

     * If one test should assemble/link under ILP32, then add ILP32 expected
       results.
     * If one test can't assemble/link under ILP32, run it through
       "run_dump_test_lp64".

OK for master?

ld/ChangeLog:
2016-12-05  Jiong Wang<jiong.wang@arm.com>

         * testsuite/ld-aarch64/aarch64-elf.exp (aarch64_choose_lp64_emul): New
         function.
         (run_dump_test_lp64): New function which pass LP64 mode options to both
         assembler and linker when building test binary.
         (aarch64elftests): Remove eh-frame-merge test.
         (eh-frame-merge-lp64): Restrict eh-frame-merge test to LP64 only.
         (run_dump_test): Migrate to run_dump_test_lp64 if the test source was
         written for LP64 only.
         * testsuite/ld-aarch64/erratum843419.d: Support ILP32 mode.
         * testsuite/ld-aarch64/farcall-b-defsym.d: Likewise.
         * testsuite/ld-aarch64/farcall-b-plt.d: Likewise.
         * testsuite/ld-aarch64/farcall-b.d: Likewise.
         * testsuite/ld-aarch64/farcall-bl-defsym.d: Likewise.
         * testsuite/ld-aarch64/farcall-bl-plt.d: Likewise.
         * testsuite/ld-aarch64/farcall-bl.d: Likewise.
         * testsuite/ld-aarch64/ifunc-15.d: Likewise.
         * testsuite/ld-aarch64/ifunc-16.d: Likewise.
         * testsuite/ld-aarch64/ifunc-5a-local.d: Likewise.
         * testsuite/ld-aarch64/ifunc-5a.d: Likewise.
         * testsuite/ld-aarch64/ifunc-5b-local.d: Likewise.
         * testsuite/ld-aarch64/ifunc-5b.d: Likewise.
         * testsuite/ld-aarch64/ifunc-5r-local.d: Likewise.
         * testsuite/ld-aarch64/ifunc-6a.d: Likewise.
         * testsuite/ld-aarch64/ifunc-6b.d: Likewise.
         * testsuite/ld-aarch64/ifunc-7a.d: Likewise.
         * testsuite/ld-aarch64/ifunc-7b.d: Likewise.
         * testsuite/ld-aarch64/ifunc-8.d: Likewise.
         * testsuite/ld-aarch64/limit-b.d: Likewise.
         * testsuite/ld-aarch64/limit-bl.d: Likewise.

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