RFR: JDK-8264517: C2: make MachCallNode::return_value_is_used() only available for x86

[Tobias Holenstein]

Added #ifndef _LP64 guard to the MachCallNode::return_value_is_used() method in src/hotspot/share/opto/machnode.* because it is only used for 32-bit x86.

Thanks, 
Tobias

-------------

Commit messages:
 - JDK-8272771: removed dead returns_long()
 - JDK-8264517: C2: make MachCallNode::return_value_is_used() only available for x86

Changes: https://git.openjdk.java.net/jdk/pull/5435/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5435&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8264517
  Stats: 4 lines in 2 files changed: 2 ins; 1 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5435.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5435/head:pull/5435

PR: https://git.openjdk.java.net/jdk/pull/5435