Add UPDATING entries and bump version numbers.

Approved by:	so

UPDATING

@@ -16,6 +16,13 @@ from older versions of FreeBSD, try WITHOUT_CLANG and WITH_GCC to bootstrap to
 the tip of head, and then rebuild without this option. The bootstrap process
 from older version of current across the gcc/clang cutover is a bit fragile.
 
+20191112	p1	FreeBSD-EN-19:19.loader
+			FreeBSD-SA-19:25.mcepsc
+
+	Fix UEFI Loader Memory Fragmentation [EN-19:19.loader]
+
+	Fix Machine Check Exception on Page Size Change [SA-19:25.mcepsc]
+	
 20191104:
 	12.1-RELEASE.
 

sys/conf/newvers.sh

@@ -46,7 +46,7 @@
 
 TYPE="FreeBSD"
 REVISION="12.1"
-BRANCH="RELEASE"
+BRANCH="RELEASE-p1"
 if [ -n "${BRANCH_OVERRIDE}" ]; then
 	BRANCH=${BRANCH_OVERRIDE}
 fi