RFR: 8293340: [cleanup] Remove unused _code in TemplateInterpreterGenerator

[xpbob]

Hi all,
The _code arg in TemplateInterpreterGenerator is unused 
Remove `_code`
Thanks.

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Commit messages:
 - 8293340: [cleanup] Remove unused _code in TemplateInterpreterGenerator

Changes: https://git.openjdk.org/jdk/pull/10156/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10156&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8293340
  Stats: 5 lines in 5 files changed: 0 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/10156.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10156/head:pull/10156

PR: https://git.openjdk.org/jdk/pull/10156