hg: jdk9/hs-gc/hotspot: 8062808: Turn on the -Wreturn-type warning

[stefan.karlsson at oracle.com]

Changeset: ef7449e07592
Author:    stefank
Date:      2014-11-12 13:55 +0100
URL:       http://hg.openjdk.java.net/jdk9/hs-gc/hotspot/rev/ef7449e07592

8062808: Turn on the -Wreturn-type warning
Reviewed-by: mgerdin, tschatzl, coleenp, jrose, kbarrett

! make/linux/makefiles/gcc.make
! src/cpu/x86/vm/x86_32.ad
! src/os_cpu/linux_x86/vm/os_linux_x86.cpp
! src/share/vm/classfile/defaultMethods.cpp
! src/share/vm/classfile/symbolTable.cpp
! src/share/vm/classfile/systemDictionary.cpp
! src/share/vm/memory/heapInspection.hpp
! src/share/vm/memory/metaspaceShared.hpp
! src/share/vm/oops/constantPool.hpp
! src/share/vm/prims/jvm.cpp
! src/share/vm/runtime/reflection.cpp
! src/share/vm/runtime/sharedRuntime.cpp
! src/share/vm/services/memTracker.hpp