hg: amber/amber: ConstablesVisitor needs two passes to handle forward references

[vicente.romero at oracle.com]

Changeset: c6df9d85827a
Author:    vromero
Date:      2018-02-06 18:22 -0500
URL:       http://hg.openjdk.java.net/amber/amber/rev/c6df9d85827a

ConstablesVisitor needs two passes to handle forward references

! src/jdk.compiler/share/classes/com/sun/tools/javac/comp/ConstablesVisitor.java
+ test/langtools/tools/javac/specialConstantFolding/TwoVisitsAreNeededCauseOfForwardRefTest.java