java/openjdk8: Fix build on armv6/7

PR:		255326
Reported by:	tech-lists@zyxst.net
Approved by:	portmgr (tier-2 / build fix blanket)

java/openjdk8/files/patch-hotspot_src_os__cpu_bsd__zero_vm_os__bsd__zero.cpp

@@ -0,0 +1,24 @@
+--- hotspot/src/os_cpu/bsd_zero/vm/os_bsd_zero.cpp.orig	2021-04-26 16:05:58 UTC
++++ hotspot/src/os_cpu/bsd_zero/vm/os_bsd_zero.cpp
+@@ -446,21 +446,6 @@ extern "C" {
+   }
+ };
+ 
+-/////////////////////////////////////////////////////////////////////////////
+-// Implementations of atomic operations not supported by processors.
+-//  -- http://gcc.gnu.org/onlinedocs/gcc-4.2.1/gcc/Atomic-Builtins.html
+-
+-#ifndef _LP64
+-extern "C" {
+-  long long unsigned int __sync_val_compare_and_swap_8(
+-    volatile void *ptr,
+-    long long unsigned int oldval,
+-    long long unsigned int newval) {
+-    ShouldNotCallThis();
+-    return 0; // silence compiler warnings
+-  }
+-};
+-#endif // !_LP64
+ 
+ #ifndef PRODUCT
+ void os::verify_stack_alignment() {

java/openjdk8/files/patch-hotspot_src_os_bsd_vm_os__perf__bsd.cpp

@@ -0,0 +1,18 @@
+--- hotspot/src/os/bsd/vm/os_perf_bsd.cpp.orig	2021-04-26 16:00:48 UTC
++++ hotspot/src/os/bsd/vm/os_perf_bsd.cpp
+@@ -43,6 +43,15 @@
+   #include <mach/task_info.h>
+ #else
+   #ifndef __NetBSD__
++    #ifdef __FreeBSD__
++      /*
++       * Older versions of FreeBSD accidentally include machine/frame.h from
++       * sys/user.h header. Disable this bad behavior, because a
++       * 'non-standard' structure 'frame' conflict with an internal structure
++       * with the same name.
++       */
++      #define _MACHINE_PCB_H_
++    #endif
+     #include <sys/user.h>
+   #endif
+   #include <sys/sched.h>