RFR: 8277860: PPC: Remove duplicate info != NULL check

[Roman Kennke]

I made a mistake: I should have fixed the duplicated info != NULL check in LIR_Assembler::emit_load_klass() in c1_LIRAssembler_ppc.cpp but forgot until the second I sent the integrate command.

I have no access to PPC hardware, I am sending this blindly, relying only on GHA tests.

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Commit messages:
 - 8277860: PPC: Remove duplicate info != NULL check

Changes: https://git.openjdk.java.net/jdk/pull/6571/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6571&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8277860
  Stats: 6 lines in 1 file changed: 0 ins; 2 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6571.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6571/head:pull/6571

PR: https://git.openjdk.java.net/jdk/pull/6571