[aarch64-port-dev ] RFR(M): 8233743: AArch64: Make r27 conditionally allocatable

[Pengfei Li]

Hi,

I'm back for this patch.

> That is starting to sound very attractive. With a 64-bit address space I'm
> finding it very hard to imagine a scenario in which we don't find a suitable
> address. I think AOT-compiled code would still be OK, because it generates
> different code, but we'd have to do some testing.

Since Nick's recent metaspace reservation fix [1] has completely removed the use of r27, my patch becomes much simpler now. I have removed the condition of UseCompressedClassPointers, rebased the code and created a new webrev. Could you please help review again?

Webrev: http://cr.openjdk.java.net/~pli/rfr/8233743/webrev.02/

[1] http://hg.openjdk.java.net/jdk/jdk/rev/dd4b4f273274

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Thanks,
Pengfei