gold patch committed: Build fixes for clang

[Ian Lance Taylor]

I got a report of some warnings building gold with clang.  This patch
fixes them.  Committed to mainline.

Ian


2012-04-25  Ian Lance Taylor  <iant@google.com>

	* arm.cc (Target_arm::do_is_defined_by_abi): Make sym a const
	pointer.
	(Stub_addend_reader::operator()): Declare Arm_relocate_functions
	as a class, not a struct.
	(Target_arm::scan_span_for_cortex_a8_erratum): Likewise.
	(Target_arm::apply_cortex_a8_workaround): Likewise.
	* gc.h: Declare Reloc_types as a struct, not a class.
	* object.h: Declare Symbols_data as a struct.
	* reloc.h: Declare Read_relocs_data as a struct.
	* target.h: Declare Relocate_info as a struct.


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