LRB midpath code quality

[Roland Westrelin]

See patch below. Something got dropped accidentally it seems.

Roland.

diff -r 6075f6799044 src/hotspot/share/opto/lcm.cpp
--- a/src/hotspot/share/opto/lcm.cpp	Fri Feb 22 12:21:36 2019 +0100
+++ b/src/hotspot/share/opto/lcm.cpp	Wed Mar 06 13:34:24 2019 +0100
@@ -178,6 +178,8 @@
     case Op_LoadRange:
     case Op_LoadD_unaligned:
     case Op_LoadL_unaligned:
+      assert(mach->in(2) == val, "should be address");
+      break;
     case Op_StoreB:
     case Op_StoreC:
     case Op_StoreCM: