RFR: 8366195: Remove unnecessary quotes around -Ta ml64 assembler argument

[Saint Wesonga]

This PR cleans up the handling of the -Ta argument by removing the quotes that were unintentionally added around the argument and moving the declaration of the argument to match -Fo as suggested in https://github.com/openjdk/jdk/pull/26791

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Commit messages:
 - Move ml64 -Ta argument and remove quotes around it

Changes: https://git.openjdk.org/jdk/pull/27021/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27021&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8366195
  Stats: 12 lines in 3 files changed: 5 ins; 6 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/27021.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27021/head:pull/27021

PR: https://git.openjdk.org/jdk/pull/27021