s390x: [ptr-compr] enable sparkplug

Change-Id: I23b2130798d28c479dfe6394ce6baf9503e74a1e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3904432
Commit-Queue: Junliang Yan <junyan@redhat.com>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83346}

src/common/globals.h

@@ -141,12 +141,7 @@ namespace internal {
 #define ENABLE_CONTROL_FLOW_INTEGRITY_BOOL false
 #endif
 
-#if (V8_TARGET_ARCH_S390X && COMPRESS_POINTERS_BOOL)
-// TODO(v8:11421): Enable Sparkplug for these architectures.
-#define ENABLE_SPARKPLUG false
-#else
 #define ENABLE_SPARKPLUG true
-#endif
 
 #if V8_TARGET_ARCH_ARM || V8_TARGET_ARCH_ARM64
 // Set stack limit lower for ARM and ARM64 than for other architectures because: