PATCH: Use a hash table for 26X linker speedup

[Paul Brook]

> bfd/ChangeLog
> 2005-10-04  Nick Clifton  <nickc@redhat.com>
>
> 	* elf32-arm.c (get_arm_elf_section_data): Cache the last pointer
> 	matched so that the typical case of scanning for the previous
> 	section to last one can be handled quickly.

It's still quite slow with this patch.  
unrecord_section_with_arm_elf_section_data has the same problem.

The attached patch uses the cache for this as well, and avoids leaving 
last_entry pointing a a free'd object.

Tested with cross to arm-none-eabi.
Ok?

Paul

2005-10-19  Paul Brook  <paul@codesourcery.com>

	* elf32-arm.c (find_arm_elf_section_entry): New function.
	(get_arm_elf_section_data,
	unrecord_section_with_arm_elf_section_data): Use it.
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