RFR: JDK-8266601: Fix bugs in AddLNode::Ideal transformations

[John Tortugo]

Some small fixes to the IR transformations performed in AddLNode::Ideal. 
Tested (x86) Fastdebug build with JDK-tier1/2/3 and hotspot {tier1, compiler, serviceability, runtime, misc, tier1_compiler} running on Linux, macOS and Windows.

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Commit messages:
 - Remove new line at end of file.
 - Fixes on AddLNode Ideal transformations
 - Merge pull request #2 from openjdk/master
 - Merge pull request #1 from openjdk/master

Changes: https://git.openjdk.java.net/jdk/pull/3955/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3955&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8266601
  Stats: 12 lines in 1 file changed: 0 ins; 10 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3955.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3955/head:pull/3955

PR: https://git.openjdk.java.net/jdk/pull/3955