* expression.cs: LocalTemporary: a new expression used to
reference a temporary that has been created.
* assign.cs: Handle PropertyAccess back here, so that we can
provide the proper semantic access to properties.
svn path=/trunk/mcs/; revision=1165
* expression.cs (Expression::ConvertReferenceExplicit): Implement
a few more explicit conversions.
* modifiers.cs: `NEW' modifier maps to HideBySig.
* expression.cs (PropertyExpr): Make this into an
ExpressionStatement, and support the EmitStatement code path.
Perform get/set error checking, clean up the interface.
* assign.cs: recognize PropertyExprs as targets, and if so, turn
them into toplevel access objects.
svn path=/trunk/mcs/; revision=1164
