Add PRESERVE8 directive#2110
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Add this directive to inform the linker that codes in this file preserve 8-byte alignment of the stack, thus eliminating `Warning: L6306W: '~PRES8' section irq_handler_chain.o(.data) should not use the address of 'REQ8' function irq_add_tail_to_free_list.`. ref: https://developer.arm.com/documentation/100068/0620/Migrating-from-armasm-to-the-armclang-Integrated-Assembler/Miscellaneous-directives
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Add this directive to inform the linker that codes in this file preserve 8-byte alignment of the stack, thus eliminating
Warning: L6306W: '~PRES8' section irq_handler_chain.o(.data) should not use the address of 'REQ8' function irq_add_tail_to_free_list..Reference: Miscellaneous directives