RFR: Use properly-scoped FormatBuffers instead of err_msg when message is retained

[Roman Kennke]

Yes please

Am 23. Januar 2018 12:05:15 MEZ schrieb Aleksey Shipilev <shade at redhat.com>:
>http://cr.openjdk.java.net/~shade/shenandoah/formatbuffers/webrev.01/
>
>It seems we cannot use err_msg the way we do it now, when its result is
>retained for later. In this
>case, we have to use the properly-scoped FormatBuffer that has clear
>lifetime. Otherwise, on some
>platforms and compilers we have this:
>
>[0.620s][info][gc] GC(0) Pause Init Mark 5.032ms
>[0.661s][info][gc] GC(0) \u0008 1M->1M(7912M) 40.084ms
>[0.708s][info][gc] GC(0) \u0008 47.164ms
>
>Testing: hotspot_gc_shenandoah, eyeballing the GC logs on failing
>configs
>
>Thanks,
>-Aleksey

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