Merge bleeding_edge revision (5922, 5934] to isolates branch....

src/platform-linux.cc

Index: src/platform-linux.cc
===================================================================
--- src/platform-linux.cc	(revision 6894)
+++ src/platform-linux.cc	(working copy)
@@ -189,21 +189,10 @@
 }
 
 
-#ifdef V8_TARGET_ARCH_ARM
-// 0xffff0fa0 is the hard coded address of a function provided by
-// the kernel which implements a memory barrier. On older
-// ARM architecture revisions (pre-v6) this may be implemented using
-// a syscall. This address is stable, and in active use (hard coded)
-// by at least glibc-2.7 and the Android C library.
-typedef void (*LinuxKernelMemoryBarrierFunc)(void);
-LinuxKernelMemoryBarrierFunc pLinuxKernelMemoryBarrier __attribute__((weak)) =
-    (LinuxKernelMemoryBarrierFunc) 0xffff0fa0;
-#endif
-
 void OS::ReleaseStore(volatile AtomicWord* ptr, AtomicWord value) {
 #if defined(V8_TARGET_ARCH_ARM) && defined(__arm__)
   // Only use on ARM hardware.
-  pLinuxKernelMemoryBarrier();
+  MemoryBarrier();
 #else
   __asm__ __volatile__("" : : : "memory");
   // An x86 store acts as a release barrier.