Fix unused parameter warnings.

PiperOrigin-RevId: 850183045

Author: markdroth

upb/port/sanitizers.h

@@ -37,6 +37,7 @@ UPB_INLINE uint8_t _upb_Xsan_NextTag(upb_Xsan *xsan) {
   }
   return xsan->state;
 #else
+  UPB_UNUSED(xsan);
   return 0;
 #endif
 }
@@ -53,13 +54,27 @@ UPB_INLINE uint8_t UPB_PRIVATE(_upb_Xsan_GetTag)(const void *addr) {
 #if UPB_HWASAN
   return __hwasan_get_tag_from_pointer(addr);
 #else
+  UPB_UNUSED(addr);
   return 0;
 #endif
 }
 
 UPB_INLINE void UPB_PRIVATE(upb_Xsan_Init)(upb_Xsan *xsan) {
 #if UPB_HWASAN || UPB_TSAN
   xsan->state = 0;
+#else
+  UPB_UNUSED(xsan);
+#endif
+}
+
+UPB_INLINE void UPB_PRIVATE(upb_Xsan_MarkInitialized)(void* addr, size_t size) {
+#if UPB_HAS_FEATURE(memory_sanitizer)
+  if (size) {
+    __msan_unpoison(addr, size);
+  }
+#else
+  UPB_UNUSED(addr);
+  UPB_UNUSED(size);
 #endif
 }
 
@@ -72,6 +87,9 @@ UPB_INLINE void UPB_PRIVATE(upb_Xsan_PoisonRegion)(const void *addr,
   __asan_poison_memory_region(addr, size);
 #elif UPB_HWASAN
   __hwasan_tag_memory(addr, UPB_HWASAN_POISON_TAG, UPB_ALIGN_MALLOC(size));
+#else
+  UPB_UNUSED(addr);
+  UPB_UNUSED(size);
 #endif
 }
 
@@ -149,13 +167,17 @@ UPB_INLINE void UPB_PRIVATE(upb_Xsan_AccessReadOnly)(upb_Xsan *xsan) {
 #if UPB_TSAN
   // For performance we avoid using a volatile variable.
   __asm__ volatile("" ::"r"(xsan->state));
+#else
+  UPB_UNUSED(xsan);
 #endif
 }
 
 UPB_INLINE void UPB_PRIVATE(upb_Xsan_AccessReadWrite)(upb_Xsan *xsan) {
 #if UPB_TSAN
   // For performance we avoid using a volatile variable.
   __asm__ volatile("" : "+r"(xsan->state));
+#else
+  UPB_UNUSED(xsan);
 #endif
 }