diff -r c25572739e7c -r f6641fcf7b7e src/hotspot/share/c1/c1_ValueMap.cpp
--- a/src/hotspot/share/c1/c1_ValueMap.cpp	Wed Aug 08 15:31:06 2018 +0200
+++ b/src/hotspot/share/c1/c1_ValueMap.cpp	Wed Aug 08 15:31:06 2018 +0200
@@ -485,9 +485,9 @@
 
 
 GlobalValueNumbering::GlobalValueNumbering(IR* ir)
-  : _current_map(NULL)
+  : _compilation(ir->compilation())
+  , _current_map(NULL)
   , _value_maps(ir->linear_scan_order()->length(), ir->linear_scan_order()->length(), NULL)
-  , _compilation(ir->compilation())
 {
   TRACE_VALUE_NUMBERING(tty->print_cr("****** start of global value numbering"));