[lworld] RFR: 8271528: [lworld] [TESTBUG] Several C2 IR tests fail on AArch64

[Nick Gasson]

The regexes just need to be adjusted slightly for the different opto assembly output.  Also removed an unnecessary extra black line after some loadConP instructions which caused match failures.

Test hotspot_valhalla on x86 and AArch64.

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Commit messages:
 - 8271528: [lworld] [TESTBUG] Several C2 IR tests fail on AArch64

Changes: https://git.openjdk.java.net/valhalla/pull/515/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=515&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8271528
  Stats: 15 lines in 2 files changed: 3 ins; 0 del; 12 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/515.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/515/head:pull/515

PR: https://git.openjdk.java.net/valhalla/pull/515