fixup! src: add allocation utils to env

Author: addaleax

src/env-inl.h

@@ -743,8 +743,7 @@ inline AllocatedBuffer::AllocatedBuffer(Environment* env, uv_buf_t buf)
 inline void AllocatedBuffer::Resize(size_t len) {
   char* new_data = env_->Reallocate(buffer_.base, buffer_.len, len);
   CHECK_IMPLIES(len > 0, new_data != nullptr);
-  buffer_.base = new_data;
-  buffer_.len = len;
+  buffer_ = uv_buf_init(new_data, len);
 }
 
 inline uv_buf_t AllocatedBuffer::release() {

src/env.h

@@ -501,6 +501,8 @@ struct AllocatedBuffer {
 
  private:
   Environment* env_;
+  // We do not pass this to libuv directly, but uv_buf_t is a convenient way
+  // to represent a chunk of memory, and plays nicely with other parts of core.
   uv_buf_t buffer_;
 
   friend class Environment;