Add memory barrier patch

Author: JakubVanek

build/barrier.patch

@@ -0,0 +1,21 @@
+diff -r b09e56145e11 src/hotspot/os_cpu/linux_arm/orderAccess_linux_arm.inline.hpp
+--- a/src/hotspot/os_cpu/linux_arm/orderAccess_linux_arm.inline.hpp	Thu Mar 08 04:23:31 2018 +0000
++++ b/src/hotspot/os_cpu/linux_arm/orderAccess_linux_arm.inline.hpp	Tue Mar 27 22:40:37 2018 +0200
+@@ -71,7 +71,7 @@
+      __asm__ volatile (
+      ".word 0xF57FF050 | 0xf" : : : "memory");
+ #endif
+-   } else {
++   } else if (VM_Version::arm_arch() == 6) {
+      intptr_t zero = 0;
+      __asm__ volatile (
+        "mcr p15, 0, %0, c7, c10, 5"
+@@ -95,7 +95,7 @@
+      __asm__ volatile (
+      ".word 0xF57FF050 | 0xe" : : : "memory");
+ #endif
+-   } else {
++   } else if (VM_Version::arm_arch() == 6) {
+      intptr_t zero = 0;
+      __asm__ volatile (
+        "mcr p15, 0, %0, c7, c10, 5"