PPC/s390: Fix native compilation failures on ppc

R=joransiu@ca.ibm.com

Drive-by: clean up the macro on s390x since it's not used.
Change-Id: I317508c1f8a1520ee8873b4323cacd63b8a7cce2
Reviewed-on: https://chromium-review.googlesource.com/c/1398121Reviewed-by: Joran Siu <joransiu@ca.ibm.com>
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#58599}

src/ppc/assembler-ppc.h

@@ -52,8 +52,6 @@
 #include "src/ppc/constants-ppc.h"
 #include "src/ppc/register-ppc.h"
 
-#define INSTR_AND_DATA_CACHE_COHERENCY LWSYNC
-
 namespace v8 {
 namespace internal {
 

src/ppc/cpu-ppc.cc

@@ -8,6 +8,8 @@
 
 #include "src/cpu-features.h"
 
+#define INSTR_AND_DATA_CACHE_COHERENCY LWSYNC
+
 namespace v8 {
 namespace internal {
 
@@ -44,4 +46,5 @@ void CpuFeatures::FlushICache(void* buffer, size_t size) {
 }  // namespace internal
 }  // namespace v8
 
+#undef INSTR_AND_DATA_CACHE_COHERENCY
 #endif  // V8_TARGET_ARCH_PPC

src/s390/assembler-s390.h

@@ -78,8 +78,6 @@
 
 #define ABI_CALL_VIA_IP 1
 
-#define INSTR_AND_DATA_CACHE_COHERENCY LWSYNC
-
 namespace v8 {
 namespace internal {