hg: jdk/sandbox: 8209817: stack is executable when building with Clang on Linux

[chris.hegarty at oracle.com]

Changeset: eb2adb0a9b09
Author:    martin
Date:      2018-09-19 10:51 -0700
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/eb2adb0a9b09

8209817: stack is executable when building with Clang on Linux
Reviewed-by: dholmes, martin, mikael, ihse
Contributed-by: Arthur Eubanks <aeubanks at google.com>

! make/autoconf/flags-ldflags.m4
! make/autoconf/toolchain.m4
! test/hotspot/jtreg/runtime/execstack/TestCheckJDK.java