Respect `NDEBUG_SANITIZER`

Often code needs to know that it's built with sanitizers.
There are two common use for such information:
1. Work around incompatibility with sanitizers
2. Use sanitizers for more aggressive bug detection

With the current `ABSL_HAVE_*_SANITIZER` we can't distinguish
this two cased, and we didn't need that before.

Now user can define `NDEBUG_SANITIZER` to ask code like this
to avoid unnecessary checks.

I am not 100% sure that `NDEBUG` is not enough.
However relying on `NDEBUG` today will relax many tests, which
runs in NDEBUG mode only. So new `NDEBUG_SANITIZER` is safer
approach.

PiperOrigin-RevId: 619268413
Change-Id: I58185cd6886593a3742b8424deccdec366c2a35a

absl/container/internal/btree.h

@@ -77,9 +77,10 @@ namespace container_internal {
 
 
 #ifdef ABSL_BTREE_ENABLE_GENERATIONS
 #ifdef ABSL_BTREE_ENABLE_GENERATIONS
 #error ABSL_BTREE_ENABLE_GENERATIONS cannot be directly set
 #error ABSL_BTREE_ENABLE_GENERATIONS cannot be directly set
-#elif defined(ABSL_HAVE_ADDRESS_SANITIZER) || \
+#elif (defined(ABSL_HAVE_ADDRESS_SANITIZER) ||   \
        defined(ABSL_HAVE_HWADDRESS_SANITIZER) || \
        defined(ABSL_HAVE_HWADDRESS_SANITIZER) || \
-    defined(ABSL_HAVE_MEMORY_SANITIZER)
+       defined(ABSL_HAVE_MEMORY_SANITIZER)) &&   \
+    !defined(NDEBUG_SANITIZER)  // If defined, performance is important.
 // When compiled in sanitizer mode, we add generation integers to the nodes and
 // When compiled in sanitizer mode, we add generation integers to the nodes and
 // iterators. When iterators are used, we validate that the container has not
 // iterators. When iterators are used, we validate that the container has not
 // been mutated since the iterator was constructed.
 // been mutated since the iterator was constructed.

absl/container/internal/raw_hash_set.h

@@ -240,9 +240,10 @@ namespace container_internal {
 
 
 #ifdef ABSL_SWISSTABLE_ENABLE_GENERATIONS
 #ifdef ABSL_SWISSTABLE_ENABLE_GENERATIONS
 #error ABSL_SWISSTABLE_ENABLE_GENERATIONS cannot be directly set
 #error ABSL_SWISSTABLE_ENABLE_GENERATIONS cannot be directly set
-#elif defined(ABSL_HAVE_ADDRESS_SANITIZER) || \
+#elif (defined(ABSL_HAVE_ADDRESS_SANITIZER) ||   \
        defined(ABSL_HAVE_HWADDRESS_SANITIZER) || \
        defined(ABSL_HAVE_HWADDRESS_SANITIZER) || \
-    defined(ABSL_HAVE_MEMORY_SANITIZER)
+       defined(ABSL_HAVE_MEMORY_SANITIZER)) &&   \
+    !defined(NDEBUG_SANITIZER)  // If defined, performance is important.
 // When compiled in sanitizer mode, we add generation integers to the backing
 // When compiled in sanitizer mode, we add generation integers to the backing
 // array and iterators. In the backing array, we store the generation between
 // array and iterators. In the backing array, we store the generation between
 // the control bytes and the slots. When iterators are dereferenced, we assert
 // the control bytes and the slots. When iterators are dereferenced, we assert