hg: graal/graal-compiler: Handle special case where unproxifying a value returns null, because the value was already deleted.

[doug.simon at oracle.com]

Changeset: d6a2b901dced
Author:    Thomas Wuerthinger <thomas.wuerthinger at oracle.com>
Date:      2015-11-24 15:15 +0100
URL:       http://hg.openjdk.java.net/graal/graal-compiler/rev/d6a2b901dced

Handle special case where unproxifying a value returns null, because the value was already deleted.

! graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/DominatorConditionalEliminationPhase.java