configure.ac: Add test for ARM TLS support.

	* configure.ac: Add test for ARM TLS support.
	* configure: Regenerated.
	* config/arm/arm-protos.h (legitimize_tls_address)
	(arm_tls_referenced_p, tls_mentioned_p)
	(arm_output_addr_const_extra): New prototypes.
	(thumb_legitimize_pic_address): Delete.
	* config/arm/arm.c: Include "gt-arm.h".
	(enum tls_reloc): New.
	(arm_cannot_copy_insn_p, arm_tls_symbol_p, load_tls_operand)
	(pcrel_constant_p, get_tls_get_addr, arm_load_tp)
	(arm_call_tls_get_addr, legitimize_tls_address)
	(arm_tls_referenced_p, arm_tls_operand_p_1, tls_mentioned_p)
	(arm_init_tls_builtins, arm_emit_tls_decoration)
	(arm_output_addr_const_extra): New functions.
	(TARGET_CANNOT_COPY_INSN_P, TARGET_CANNOT_FORCE_CONST_MEM)
	(TARGET_HAVE_TLS): Define.
	(target_thread_pointer): New.
	(arm_override_options): Handle -mtp=.
	(legitimize_pic_address): Ignore UNSPECs.
	(arm_legitimate_address_p, thumb_legitimate_address_p): Handle PC
	relative symbols.
	(arm_legitimize_address, thumb_legitimize_address): Handle TLS.
	(tls_get_addr_libfunc): New variable.
	(symbol_mentioned_p, label_mentioned_p): Ignore UNSPEC_TLS.
	(arm_init_builtins): Call arm_init_tls_builtins.
	(arm_expand_builtin): Handle ARM_BUILTIN_THREAD_POINTER.
	(arm_encode_section_info): Call default_encode_section_info.
	* config/arm/arm.h (TARGET_HARD_TP, TARGET_SOFT_TP): Define.
	(enum arm_tp_type): New.
	(target_thread_pointer): Add declaration.
	(LEGITIMATE_CONSTANT_P): Handle TLS.
	(LEGITIMATE_PIC_OPERAND_P): Handle TLS.
	(OUTPUT_ADDR_CONST_EXTRA): Call arm_output_addr_const_extra.
	(enum arm_builtins): Add ARM_BUILTIN_THREAD_POINTER.
	* config/arm/arm.md: Add UNSPEC_TLS.
	(movsi): Handle TLS.
	(pic_add_dot_plus_four, pic_add_dot_plus_eight): Allow for
	non-PIC.
	(tls_load_dot_plus_eight): New insn and a peephole to create it.
	(load_tp_hard, load_tp_soft): New insns.
	* arm.opt: Add -mtp=.
	* doc/invoke.texi (ARM Options): Document -mtp.

Co-Authored-By: Paul Brook <paul@codesourcery.com>
Co-Authored-By: Phil Blundell <pb@reciva.com>

From-SVN: r106489