code size optimization, moved function definition to the source file

PiperOrigin-RevId: 490775181

src/google/protobuf/io/coded_stream.cc

diff --git a/src/google/protobuf/io/coded_stream.cc b/src/google/protobuf/io/coded_stream.cc
index 8f08e7b..0ebc0f2 100644
--- a/src/google/protobuf/io/coded_stream.cc
+++ b/src/google/protobuf/io/coded_stream.cc
@@ -722,6 +722,13 @@
 
 // CodedOutputStream =================================================
 
+uint8_t* EpsCopyOutputStream::EnsureSpace(uint8_t* ptr) {
+  if (PROTOBUF_PREDICT_FALSE(ptr >= end_)) {
+    return EnsureSpaceFallback(ptr);
+  }
+  return ptr;
+}
+
 void EpsCopyOutputStream::EnableAliasing(bool enabled) {
   aliasing_enabled_ = enabled && stream_->AllowsAliasing();
 }

src/google/protobuf/io/coded_stream.h

diff --git a/src/google/protobuf/io/coded_stream.h b/src/google/protobuf/io/coded_stream.h
index 0615941..57a171e 100644
--- a/src/google/protobuf/io/coded_stream.h
+++ b/src/google/protobuf/io/coded_stream.h
@@ -674,12 +674,7 @@
   // After this it's guaranteed you can safely write kSlopBytes to ptr. This
   // will never fail! The underlying stream can produce an error. Use HadError
   // to check for errors.
-  PROTOBUF_NODISCARD uint8_t* EnsureSpace(uint8_t* ptr) {
-    if (PROTOBUF_PREDICT_FALSE(ptr >= end_)) {
-      return EnsureSpaceFallback(ptr);
-    }
-    return ptr;
-  }
+  PROTOBUF_NODISCARD PROTOBUF_NOINLINE uint8_t* EnsureSpace(uint8_t* ptr);
 
   uint8_t* WriteRaw(const void* data, int size, uint8_t* ptr) {
     if (PROTOBUF_PREDICT_FALSE(end_ - ptr < size)) {