[PATCH][gold] Fix an internal error in the constructor of Target_arm.

[Igor Kudrin]

Hi,

In some cases, a Target object may be created before all the options
are read, for instance, if the used linker script contains
an OUTPUT_FORMAT statement. Consequently, the initialization for target
relocations cannot be done in the constructor and should be delayed.

Best regards,
Igor Kudrin

---
gold/ChangeLog

	* arm.cc (Arm_scan_relocatable_relocs::local_section_strategy):
	Adjust call to Target_arm::get_reloc_reloc_type.
	(Target_arm::target1_is_set_, Target_arm::target2_is_set_): New
	data members.
	(Target_arm::Target_arm): Initialize new data members, remove
	handling of --target1-rel, -target1-abs and --target2= options.
	(Target_arm::get_reloc_reloc_type): Remove const, Handle
	--target1-rel, --target1-abs and --target2= options.
	* testsuite/Makefile.am (arm_target_lazy_init): New test.
	* testsuite/Makefile.in: Regenerate.
	* testsuite/arm_target_lazy_init.s: New test source file.
	* testsuite/arm_target_lazy_init.sh: New test script.
	* testsuite/arm_target_lazy_init.t: New test linker script.
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