[8u20] Request for approval for JDK-8046060: Different results of floating point multiplication for lambda code block

[Robert Field]

Please approve this backport of a bug fix from jdk9.

Bug report:https://bugs.openjdk.java.net/browse/JDK-8046060
Changeset:http://hg.openjdk.java.net/jdk9/dev/langtools/rev/173f27d6e81f
jdk9 reviewers: vromero, jlahoda

-Robert