PowerPC __tls_get_addr arg parsing

The syntax we ended up with for -m32 -fPIC calls to __tls_get_addr is
rather weird.
    bl __tls_get_addr+0x8000(gd0@tlsgd)@plt
This came about by accident, probably due to requiring the arg reloc
before the call reloc.

Of course the @plt really belongs with __tls_get_addr since it affects
the call rather than the call arg, and it isn't a great deal of
trouble to ensure the relocs are emitted in the correct order.  This
patch supports a newer syntax, like so:
    bl __tls_get_addr+0x8000@plt(gd0@tlsgd)

gas/
	* config/tc-ppc.c (parse_tls_arg): New function, extracted..
	(md_assembler): ..from here.  Call it after parsing other
	suffix modifiers too.
ld/
	* testsuite/ld-powerpc/tls32.s: Test new @plt syntax.

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