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

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.

added full-ci label

added 30 commits

• bec54654...5b1aefb7 - 29 commits from branch master
• 222c6336 - Fix -freg-graphs for FP and AARch64 NCG (#24941 (closed)).

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added backport needed:9.10 backport needed:9.6 backport needed:9.8 labels

added 28 commits

• 222c6336...84dadea9 - 27 commits from branch master
• d6b31835 - Fix -freg-graphs for FP and AARch64 NCG (#24941 (closed)).

Compare with previous version

added 13 commits

• d6b31835...de5d9852 - 12 commits from branch master
• 3f89ab92 - Fix -freg-graphs for FP and AARch64 NCG (#24941 (closed)).

Compare with previous version

assigned to @marge-bot

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Merged in 3f89ab92

closed

mentioned in merge request !13320 (merged)

Backported to %9.8.3 in !13320 (merged).

removed backport needed:9.8 label