[BFD][AARCH64] Emit one single AARCH64 MAP_INSN symbol for the whole plt.

[Renlin Li]

Hi all,

This is a simple patch to insert a single AARCH64_MAP_INSN mapping 
symbol for the whole PLT section.
Before the change, there is no mapping symbol for PLT0 (the first entry 
in PLT), one AARCH64_MAP_INSN symbol is inserted at second entry.

LD, GAS regression test done without any issues, Okay to commit?

bfd/ChangeLog:

2015-09-15  Renlin Li  <renlin.li@arm.com>

     * elfnn-aarch64.c (elfNN_aarch64_output_map_sym):
     (elfNN_aarch64_output_arch_local_syms):

ld/testsuite/ChangeLog:

2015-09-15  Renlin Li  <renlin.li@arm.com>

     * ld-aarch64/aarch64-elf.exp: Run new test.
     * ld-aarch64/plt_mapping_symbol.d: New.
     * ld-aarch64/plt_mapping_symbol.s: New.
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