RFR: 8281120: G1: Rename G1BlockOffsetTablePart::alloc_block to update_for_block

[Albert Mingkun Yang]

On Wed, 2 Feb 2022 15:07:43 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Simple change of renaming certain methods.
> 
> Test: build

Thanks for the review.

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PR: https://git.openjdk.java.net/jdk/pull/7325