simplify Xtensa size_dynamic_sections code

[Bob Wilson]

The elf_xtensa_size_dynamic_sections function was using 3 separate traversals of 
the symbol hash table.  This patch combines all the work into a single pass.  It 
also removes the hide_symbol hook, since there doesn't seem to be any need for 
it: the Xtensa-specific work being done there can be handled later in 
size_dynamic_sections.  Tested with an xtensa-elf build and committed.

bfd/
	* elf32-xtensa.c (elf_xtensa_make_sym_local): Delete.
	(elf_xtensa_hide_symbol, elf_backend_hide_symbol): Delete.
	(elf_xtensa_fix_refcounts, elf_xtensa_allocate_plt_size)
	(elf_xtensa_allocate_got_size): Replace these with...
	(elf_xtensa_allocate_dynrelocs): ...this new function.
	(elf_xtensa_size_dynamic_sections): Use it.

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