* crtstuff.c: Handle targets that use .init_array.
	* function.c (HAS_INIT_SECTION): Do not define. Instead, make sure
	that INVOKE__main is set correctly.
	(expand_main_function): Test INVOKE__main.
	* libgcc2.c: Do not define __main when using .init_array.
	* config/arm/arm.c (arm_elf_asm_constructor): New function.
	* config/arm/arm.h (CTORS_SECTION_ASM_OP): Define, with specialized
	libgcc version.
	(DTORS_SECTION_ASM_OP): Likewise.
	(CTOR_LIST_BEGIN): Define specially when in libgcc.
	(CTOR_LIST_END): Likewise.
	(DTOR_LIST_BEGIN): Likewise.
	(DTOR_LIST_END): Likewise.
	* config/arm/bpapi.h (INIT_SECTION_ASM_OP): Do not define it.
	(FINI_SECTION_ASM_OP): Likewise.
	(INIT_ARRAY_SECTION_ASM_OP): Define.
	(FINI_ARRAY_SECTION_ASM_OP): Likewise.
	* config/arm/elf.h (TARGET_ASM_CONSTRUCTOR): Define.
	(SUPPORTS_INIT_PRIORITY): Evaluate to false for EABI based targets.
	* doc/tm.texi (INIT_ARRAY_SECTION_ASM_OP): Document.
	(FINI_ARRAY_SECTION_ASM_OP): Likewise.

Co-Authored-By: Mark Mitchell <mark@codesourcery.com>
Co-Authored-By: Paul Brook <paul@codesourcery.com>

From-SVN: r98986