Move PrepareInsertCommon from header file to cc file.

PiperOrigin-RevId: 755434777
Change-Id: Ic84e3dc3014b19f21ce98e8dae2529236ce4bf5e
diff --git a/absl/container/internal/raw_hash_set.cc b/absl/container/internal/raw_hash_set.cc
index f19e87b..9d3b599 100644
--- a/absl/container/internal/raw_hash_set.cc
+++ b/absl/container/internal/raw_hash_set.cc
@@ -295,6 +295,11 @@
   ABSL_UNREACHABLE();
 }
 
+void PrepareInsertCommon(CommonFields& common) {
+  common.increment_size();
+  common.maybe_increment_generation_on_insert();
+}
+
 size_t DropDeletesWithoutResizeAndPrepareInsert(CommonFields& common,
                                                 const PolicyFunctions& policy,
                                                 size_t new_hash) {
diff --git a/absl/container/internal/raw_hash_set.h b/absl/container/internal/raw_hash_set.h
index 512c946..3bc86d1 100644
--- a/absl/container/internal/raw_hash_set.h
+++ b/absl/container/internal/raw_hash_set.h
@@ -1827,11 +1827,6 @@
                                         const PolicyFunctions& policy,
                                         size_t new_capacity);
 
-inline void PrepareInsertCommon(CommonFields& common) {
-  common.increment_size();
-  common.maybe_increment_generation_on_insert();
-}
-
 // ClearBackingArray clears the backing array, either modifying it in place,
 // or creating a new one based on the value of "reuse".
 // REQUIRES: c.capacity > 0