Simplify memory size operation

wasm/runtime/luajit.lua

@@ -374,8 +374,6 @@ do
 
 	function memory.init(memory, offset, data) ffi.copy(memory.data + offset, data) end
 
-	function memory.size(memory) return memory.min end
-
 	function memory.grow(memory, num)
 		local old = memory.min
 		local new = old + num

wasm/runtime/luau.lua

@@ -267,8 +267,6 @@ do
 		end
 	end
 
-	function memory.size(memory) return memory.min end
-
 	function memory.grow(memory, num)
 		local old = memory.min
 		local new = old + num

wasm/src/writer/luajit.rs

@@ -143,7 +143,7 @@ impl Driver for AnyLoad {
 
 impl Driver for MemorySize {
 	fn visit(&self, _: &mut Visitor, w: Writer) -> Result<()> {
-		write!(w, "rt.memory.size(memory_at_{})", self.memory)
+		write!(w, "memory_at_{}.min ", self.memory)
 	}
 }
 

wasm/src/writer/luau.rs

@@ -131,7 +131,7 @@ impl Driver for AnyLoad {
 
 impl Driver for MemorySize {
 	fn visit(&self, _: &mut Visitor, w: Writer) -> Result<()> {
-		write!(w, "rt.memory.size(memory_at_{})", self.memory)
+		write!(w, "memory_at_{}.min ", self.memory)
 	}
 }