re PR target/7525 ([ARM/Thumb] long calls stubs only in one code section, cannot...

re PR target/7525 ([ARM/Thumb] long calls stubs only in one code section, cannot branch to them from other section)

PR target/7525
* arm.h (struct machine_function): Add call_via field.
(thumb_call_via_label): Declare.
* arm.c (thumb_call_via_label): New variable.
(thumb_call_reg_needed): New variable.
(arm_output_function_epilogue): For Thumb code, output any per-function
call-indirect trampolines.
(thumb_call_via_reg): New function.
(arm_file_end): New function.
(TARGET_ASM_FILE_END): Call arm_file_end.
(aof_file_end): Likewise.
* arm-protos.h (thumb_call_via_reg): Declare.
* arm.md (call_reg_thumb, call_value_reg_thumb): Call
thumb_call_via_reg in normal case.

From-SVN: r93641