RFR: 8330261: Clean up linking steps

[Erik Joelsson]

On Mon, 15 Apr 2024 12:34:53 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.

The indentation for the first line after ExecuteWithLog is done with 2 spaces everywhere in this patch, but as that's a macro call it should be 4, right? Looks like we usually do 4 in other places.

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PR Review: https://git.openjdk.org/jdk/pull/18783#pullrequestreview-2001028930