[jdk11u-dev] RFR: 8256009: Remove src/hotspot/share/adlc/Test/i486.ad

[Jie Fu]

8256009: Remove src/hotspot/share/adlc/Test/i486.ad

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Commit messages:
 - Backport a1d4b9f35b446f21b1f52bff736aa9068e8d7574

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/598/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=598&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8256009
  Stats: 11 lines in 9 files changed: 0 ins; 0 del; 11 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/598.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/598/head:pull/598

PR: https://git.openjdk.java.net/jdk11u-dev/pull/598