RFR: [11u] JDK-8205421: AARCH64: StubCodeMark should be placed after alignment

[Andrew Dinn]

Could I please have a review of this backport for JDK-8205421 which
required a few minor changes to the original patch

Upstream JIRA:   https://bugs.openjdk.java.net/browse/JDK-8205421
Upstream patch:  http://hg.openjdk.java.net/jdk/jdk/rev/2e4903f83295
Backport webrev: http://cr.openjdk.java.net/~adinn/8205421/webrev.00/

Testing:

tier1 passes -- modulo unrelated failures with SA debugger and varhandle
weakCompareAndSet

regards,


Andrew Dinn
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Senior Principal Software Engineer
Red Hat UK Ltd
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