Merge pull request #4545 from jjhursey/fix/v2.x/ppc-asm-eieio

ppc/asm: Fix opal_atomic_wmb definition

Author: hppritcha

opal/include/opal/sys/powerpc/atomic.h

@@ -103,7 +103,7 @@ void opal_atomic_wmb(void)
 #pragma mc_func opal_atomic_rmb { "7c2004ac" }         /* lwsync  */
 #pragma reg_killed_by opal_atomic_rmb                  /* none */
 
-#pragma mc_func opal_atomic_wmb { "7c0006ac" }         /* eieio */
+#pragma mc_func opal_atomic_wmb { "7c2004ac" }         /* lwsync */
 #pragma reg_killed_by opal_atomic_wmb                  /* none */
 
 #endif