[patch][gold] Fix R_ARM_TLS_LE32 when there is no TLS segment

[Rafael Espindola]

The attached patch fixes R_ARM_TLS_LE32 relocations when there is no TLS
segment. This can happen with linker scripts. I think the old code was
also wrong in the case we have a .tbss and a .tdata section. The relocations
would be correct for the section with the largest address, but not for the
other one.

2010-05-20  Rafael Espindola  <espindola@google.com>

	* arm.cc (relocated_section): New.
	(Target_arm<big_endian>::Relocate::relocate_tls): Use
	relocated_section and Layout::tls_section.
	* layout.cc (Layout::Layout): Initialize tls_section_.
	(Layout::compute_tls_section): New.
	* layout.h (Layout::tls_section, Layout::compute_tls_section,
	Layout::tls_section_): New.

(Cheers,
-- 
Rafael Ávila de Espíndola
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