Move new_cipher and new_session to SSL_HANDSHAKE.

This lets us trim another two pointers of per-connection state.

Change-Id: I2145d529bc25b7e24a921d01e82ee99f2c98867c
Reviewed-on: https://boringssl-review.googlesource.com/13804
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>

ssl/ssl_lib.c

diff --git a/ssl/ssl_lib.c b/ssl/ssl_lib.c
index 57178cf..517ddbb 100644
--- a/ssl/ssl_lib.c
+++ b/ssl/ssl_lib.c
@@ -2496,10 +2496,11 @@
 }
 
 const SSL_CIPHER *SSL_get_pending_cipher(const SSL *ssl) {
-  if (!SSL_in_init(ssl)) {
+  SSL_HANDSHAKE *hs = ssl->s3->hs;
+  if (hs == NULL) {
     return NULL;
   }
-  return ssl->s3->tmp.new_cipher;
+  return hs->new_cipher;
 }
 
 void SSL_set_retain_only_sha256_of_client_certs(SSL *ssl, int enabled) {