[lworld] RFR: 8378224: [lworld] Redundant check in CompiledEntrySignature::compute_calling_conventions

[Tobias Hartmann]

This is a leftover from when inline type arguments could be null-free. The `bt == T_OBJECT` condition is checked just above in line 2914 and always true.

Thanks,
Tobias

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Commit messages:
 - 8378224: [lworld] Redundant check in CompiledEntrySignature::compute_calling_conventions

Changes: https://git.openjdk.org/valhalla/pull/2137/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=2137&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8378224
  Stats: 5 lines in 1 file changed: 0 ins; 2 del; 3 mod
  Patch: https://git.openjdk.org/valhalla/pull/2137.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/2137/head:pull/2137

PR: https://git.openjdk.org/valhalla/pull/2137