hg: jdk8u/jdk8u-dev/hotspot: 8197429: Increased stack guard causes segfaults on x86-32

[gnu.andrew at redhat.com]

Changeset: 1485461a0fd1
Author:    aph
Date:      2018-07-06 17:25 +0100
URL:       http://hg.openjdk.java.net/jdk8u/jdk8u-dev/hotspot/rev/1485461a0fd1

8197429: Increased stack guard causes segfaults on x86-32
Reviewed-by: dholmes

! src/os/linux/vm/os_linux.cpp
! src/os/linux/vm/os_linux.hpp
! src/os_cpu/linux_x86/vm/os_linux_x86.cpp
+ test/runtime/StackGap/T.java
+ test/runtime/StackGap/exestack-gap.c
+ test/runtime/StackGap/testme.sh