hg: jdk10/hs/hotspot: 8183262: noexecstack check in os::dll_load on Linux is too expensive

[vladimir.kozlov at oracle.com]

Changeset: d0cb3b17b413
Author:    kvn
Date:      2017-07-05 11:03 -0700
URL:       http://hg.openjdk.java.net/jdk10/hs/hotspot/rev/d0cb3b17b413

8183262: noexecstack check in os::dll_load on Linux is too expensive
Summary: convert ElfFile::specifies_noexecstack() to static method which read file header and check executable stack flag.
Reviewed-by: iklam, stuefe

! src/os/linux/vm/os_linux.cpp
! src/share/vm/aot/aotLoader.cpp
! src/share/vm/utilities/elfFile.cpp
! src/share/vm/utilities/elfFile.hpp