8201509: Zero: S390 31bit atomic_copy64 inline assembler is wrong

Summary: The inline assembler for the S390 (S390 and not _LP64) has src and dst reversed thereby corrupting data
Reviewed-by: shade
Contributed-by: NMartin Balao <mbalao@redhat.com>

src/os_cpu/linux_zero/vm/os_linux_zero.hpp

@@ -50,10 +50,10 @@
                   : "Q"(*(volatile long*)src));
 #elif defined(S390) && !defined(_LP64)
     double tmp;
-    asm volatile ("ld  %0, 0(%1)\n"
-                  "std %0, 0(%2)\n"
-                  : "=r"(tmp)
-                  : "a"(src), "a"(dst));
+    asm volatile ("ld  %0, %2\n"
+                  "std %0, %1\n"
+                  : "=&f"(tmp), "=Q"(*(volatile double*)dst)
+                  : "Q"(*(volatile double*)src));
 #else
     *(jlong *) dst = *(jlong *) src;
 #endif