RFR: 8330261: Clean up linking steps [v3]

[Erik Joelsson]

On Mon, 15 Apr 2024 13:43:53 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

>> Instead of executing code directly in Link.gmk, we set variables that are then evaluated to get the code we want. This is non-transparent and makes it unnecessarily hard to work with the linking code base. 
>> 
>> This PR also contains some additional code cleanup/fixes.
>
> Magnus Ihse Bursie has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix ExecuteWithLog indentation

Marked as reviewed by erikj (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/18783#pullrequestreview-2001212672