RFR: 8330261: Clean up linking steps

Mon Apr 15 12:39:49 UTC 2024

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.

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Commit messages:
 - Also add NAME check
 - Wrap all non-trivial executions in ExecuteWithLog
 - Inline calls to tools in link recipe

Changes: https://git.openjdk.org/jdk/pull/18783/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18783&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8330261
  Stats: 112 lines in 4 files changed: 48 ins; 35 del; 29 mod
  Patch: https://git.openjdk.org/jdk/pull/18783.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18783/head:pull/18783

PR: https://git.openjdk.org/jdk/pull/18783