Integrated: More C1 fixes

[Frederic Parain]

C1 fixes in LIRGenerator.

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Commit messages:
 - More C1 fixes

Changes: https://git.openjdk.java.net/valhalla/pull/419/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=419&range=00
  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/419.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/419/head:pull/419

PR: https://git.openjdk.java.net/valhalla/pull/419