hg: jdk/hs: 8199782: Fix compilation warnings detected by Solaris Developer Studio 12.6

[erik.joelsson at oracle.com]

Changeset: fa26e7c6efb7
Author:    gadams
Date:      2018-04-05 11:18 -0700
URL:       http://hg.openjdk.java.net/jdk/hs/rev/fa26e7c6efb7

8199782: Fix compilation warnings detected by Solaris Developer Studio 12.6
Reviewed-by: sspitsyn, dholmes, ihse

! make/hotspot/lib/CompileJvm.gmk
! src/java.base/solaris/native/libjvm_db/libjvm_db.c
! test/fmw/gtest/src/gtest.cc
! test/hotspot/jtreg/runtime/libadimalloc.solaris.sparc/liboverflow.c