Start migrating upb_msglayout to be suitable for generated code.

This involves:

- remove upb_msglayout -> upb_msgfactory dependency.
- remove upb_msglayout -> upb_msgdef dependency (in progress).
- make upb_msglayout use a representation that can be
  statically initialized by generated code.

The goal here is that upb_msglayout becomes a kind of "descriptor
lite": it contains enough data to parser and serialize protobufs
and manipulate a upb_msg in memory, while being far smaller and
simpler than a full descriptor.  It also does not include field
names, which can be a benefit for applications that do not want
to leak field names.

Generated code can then create a upb_msglayout, and do most things
without ever needing to construct full descriptors/defs if they
don't want to.

1 files changed, 1 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index 09b71c4..581993b 100644
--- a/Makefile
+++ b/Makefile
@@ -463,7 +463,7 @@ testlua: lua
 	  echo LUA $$test; \
 	  LUA_PATH="third_party/lunit/?.lua;upb/bindings/lua/?.lua" \
 	    LUA_CPATH=upb/bindings/lua/?.so \
-	    lua $$test; \
+	    $(RUN_UNDER) lua $$test; \
 	done
 
 clean: clean_lua