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Fix -freg-graphs for FP and AARch64 NCG (#24941).

Andreas Klebinger requested to merge wip/andreask/aarch64_reg_graph into master 
Fix -freg-graphs for FP and AARch64 NCG (#24941).

It seems we reserve 8 registers instead of four for global regs
based on the layout in Note [AArch64 Register assignments].

I'm not sure it's neccesary, but for now we just accept this state of
affairs and simple update -fregs-graph to account for this.

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