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

[Tobias Hartmann]

On Mon, 10 May 2021 19:33:17 GMT, John Tortugo <github.com+2249648+JohnTortugo at openjdk.org> wrote:

> 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.

Marked as reviewed by thartmann (Reviewer).

Since the code is removed, JDK-8259624 should be closed as duplicate of this one then.

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