Fix JIT stack setup on aarch64/clang

[arnaud-lb]

Fixes GH-19601.

On aarch64 we must set IR_USE_FRAME_POINTER to ensure that LR/x30 is saved. Also, fixed_stack_frame_size must be n*16, not n*16+8 like on x86. This was properly handled before, but this broke due to this change, which I failed to test on aarch64:

php-src/ext/opcache/jit/zend_jit_ir.c

Lines 2735 to 2736 in fc467dc

	#if ZEND_VM_KIND == ZEND_VM_KIND_TAILCALL
	jit->ctx.fixed_stack_frame_size = sizeof(void*) * 5; /* 5 spill slots (8 bytes) or 10 spill slots (4 bytes) */

[andypost]

testing it, will report results

[andypost]

Thank you! it's passed tests using clang21! log is https://gitlab.alpinelinux.org/alpine/aports/-/jobs/1990780