C#: Add DB upgrade script

csharp/upgrades/df0118d2d283379d89c2bec5aadda78cdae0b904/localvar_info.rel

@@ -0,0 +1,15 @@
+class LocalVariable extends @local_variable {
+  string toString() { none() }
+}
+
+class TypeOrRef extends @type_or_ref {
+  string toString() { none() }
+}
+
+class LocalVarDeclExpr extends @local_var_decl_expr {
+  string toString() { none() }
+}
+
+from LocalVariable l, int implicitly_typed, TypeOrRef type, LocalVarDeclExpr parent
+where localvars(l, _, _, implicitly_typed, type, parent)
+select l, implicitly_typed, type, parent

csharp/upgrades/df0118d2d283379d89c2bec5aadda78cdae0b904/localvars.rel

@@ -0,0 +1,7 @@
+class LocalVariable extends @local_variable {
+  string toString() { none() }
+}
+
+from LocalVariable l, int kind, string name
+where localvars(l, kind, name, _, _, _)
+select l, kind, name

csharp/upgrades/df0118d2d283379d89c2bec5aadda78cdae0b904/upgrade.properties

@@ -0,0 +1,4 @@
+description: Split up localvars table into localvars and localvar_info
+compatibility: full
+localvar_info.rel: run localvar_info.rel
+localvars.rel: run localvars.rel