hg: jdk/sandbox: 8202179: Compilation fails with assert(n->is_expensive()) failed: expensive nodes with non-null control here only

[chris.hegarty at oracle.com]

Changeset: 22eb3e22f245
Author:    thartmann
Date:      2018-04-27 07:59 +0200
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/22eb3e22f245

8202179: Compilation fails with assert(n->is_expensive()) failed: expensive nodes with non-null control here only
Summary: Only treat the SqrtFNode as expensive if the control input is not NULL.
Reviewed-by: kvn, roland

! src/hotspot/share/opto/node.cpp
! src/hotspot/share/opto/subnode.hpp