RFR: 8361040: compiler/codegen/TestRedundantLea.java#StringInflate fails with failed IR rules

[Manuel Hässig]

`TestRedundantLea.java#StringInflate` failed on Alpine Linux because fewer `DecodeHeapOop_not_null`s than expected are generated even though the expected reduction is still present. This PR fixes this.

Unfortunately, this fix makes the test less precise. I filed [JDK-8361045](https://bugs.openjdk.org/browse/JDK-8361045) to fix this when the IR-framework allows for it.

Testing:
 - [x] Github Actions
 - [x] tier1, tier2 plus Oracle internal testing
 - [x] `TestRedundantLea.java` on Alpine Linux

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Commit messages:
 - Fix test

Changes: https://git.openjdk.org/jdk/pull/26046/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26046&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8361040
  Stats: 12 lines in 1 file changed: 2 ins; 6 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/26046.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26046/head:pull/26046

PR: https://git.openjdk.org/jdk/pull/26046