[Patch/ARM] Skip private symbol when doing objdump

[Jiong Wang]

__tagsym$$ is used as a prefix to tag particular symbols by the proprietary
ARM toolchain. This patch gives higher priority to proper symbol names so
that they are shown in the disassembly appropriately.

before this patch, for "objdump -D", sometime we display

__tagsym$$noinline:
    insn0
    insn1
    ...

__tagsym$$used:
    data_content
    ...

after this patch, we display:

foo:
   insn0
   insn1

global_a:
   data_content
   ...

this result make more sense for the user.

pass native full binutils check

ok for trunk?

2015-02-03  Jiong Wang  <jiong.wang@arm.com>

opcodes/
   * arm-dis.c (arm_symbol_is_valid): Skip ARM private symbols.

binutils/testsuite/
   * binutils-all/arm/rvct_symbol.s: New testcase.
   * binutils-all/arm/objdump.exp: Run it.
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