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i#1621 AArch64 cc opts: Implement analyze_callee_save_reg.

Merged Administrator requested to merge i1621-analyze-callee-saved-regs2 into master

Created by: fhahn

This patch implements analyze_callee_save_reg using stp/ldp/str/ldr [sp, #imm] patterns to detect callee saved registers.

Based on work by Kevin Zhou and Edmund Grimley-Evans.