RFR: 8278079: C2: expand_dtrace_alloc_probe doesn't take effect in macro.cpp

[Denghui Dong]

Hi,

Could I have a review of this small fix that makes expand_dtrace_alloc_probe take effect?

Thanks,
Denghui

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Commit messages:
 - 8278079: C2: expand_dtrace_alloc_probe doesn't take effect in macro.cpp

Changes: https://git.openjdk.java.net/jdk/pull/6639/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6639&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8278079
  Stats: 4 lines in 1 file changed: 0 ins; 1 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6639.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6639/head:pull/6639

PR: https://git.openjdk.java.net/jdk/pull/6639