RFR: 8311508: ZGC: RAII use of IntelJccErratumAlignment

[Thomas Schatzl]

On Tue, 8 Aug 2023 13:49:24 GMT, Axel Boldt-Christmas <aboldtch at openjdk.org> wrote:

> Fixed the locations where unnamed IntelJccErratumAlignment circumvented the correctness asserts.
> Also strengthened the asserts so that a IntelJccErratumAlignment RAII object scope must surround at least some instruction. 
> 
> Tested GHA and tier1,tier2

Marked as reviewed by tschatzl (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/15191#pullrequestreview-1569219187