Break out the upsert code into a separate source file.

FossilOrigin-Name: 389806b05f163687d8eb858b0f87f9a2d02e90af9f2097924a66715f05177613

main.mk

@@ -72,7 +72,7 @@ LIBOBJ+= vdbe.o parse.o \
          random.o resolve.o rowset.o rtree.o \
          select.o sqlite3rbu.o status.o stmt.o \
          table.o threads.o tokenize.o treeview.o trigger.o \
-         update.o userauth.o util.o vacuum.o \
+         update.o upsert.o userauth.o util.o vacuum.o \
          vdbeapi.o vdbeaux.o vdbeblob.o vdbemem.o vdbesort.o \
 	 vdbetrace.o wal.o walker.o where.o wherecode.o whereexpr.o \
          utf.o vtab.o
@@ -162,6 +162,7 @@ SRC = \
   $(TOP)/src/trigger.c \
   $(TOP)/src/utf.c \
   $(TOP)/src/update.c \
+  $(TOP)/src/upsert.c \
   $(TOP)/src/util.c \
   $(TOP)/src/vacuum.c \
   $(TOP)/src/vdbe.c \