add Xtensa-specific link hash table

[Bob Wilson]

This patch adds an Xtensa-specific link hash table, in which we can  
record the various dynamic sections.  This saves having to keep  
searching for these sections.  I also put the plt_reloc_count, which  
used to be a global, into the hash table.  Tested with an xtensa-elf  
build and committed.

bfd/
         * elf32-xtensa.c (plt_reloc_count): Move into link hash table.
         (struct elf_xtensa_link_hash_table): New.
         (elf_xtensa_hash_table): New.
         (elf_xtensa_link_hash_table_create): New.
         (elf_xtensa_check_relocs): Update plt_reloc_count references.
         Update arguments to add_extra_plt_sections.
         (elf_xtensa_create_dynamic_sections): Record new sections in  
the hash
         table.  Update for plt_reloc_count and add_extra_plt_sections.
         (add_extra_plt_sections, elf_xtensa_create_plt_entry):  
Replace dynobj
         argument with link info.  Update calls to  
elf_xtensa_get_plt_section
         and elf_xtensa_get_gotplt_section.
         (elf_xtensa_allocate_local_got_size,  
elf_xtensa_size_dynamic_sections)
         (elf_xtensa_relocate_section,  
elf_xtensa_finish_dynamic_sections)
         (elf_xtensa_discard_info_for_section,  
shrink_dynamic_reloc_sections)
         (relax_property_section): Get sections from the hash table  
and update
         function calls.
         (elf_xtensa_get_plt_section, elf_xtensa_get_gotplt_section):  
Replace
         dynobj argument with link info.  Get sections for first plt  
chunk from
         the hash table.
         (bfd_elf32_bfd_link_hash_table_create): Define.

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