reg: rename Bytes() to Size() (#74)

It was pointed out #73 that Bytes() is a poor name for the size of the register in bytes. In idiomatic Go you would probably expect a Bytes() method to return []byte.

This diff changes the Bytes() to Size(). As a result the Size type also needed to be renamed, and Width seemed a reasonable choice.

Fixes #73

build/pseudo.go

@@ -39,7 +39,7 @@ func (c *Context) Load(src gotypes.Component, dst reg.Register) reg.Register {
 		c.adderror(err)
 		return dst
 	}
-	c.mov(b.Addr, dst, int(gotypes.Sizes.Sizeof(b.Type)), int(dst.Bytes()), b.Type)
+	c.mov(b.Addr, dst, int(gotypes.Sizes.Sizeof(b.Type)), int(dst.Size()), b.Type)
 	return dst
 }
 
@@ -51,7 +51,7 @@ func (c *Context) Store(src reg.Register, dst gotypes.Component) {
 		c.adderror(err)
 		return
 	}
-	c.mov(src, b.Addr, int(src.Bytes()), int(gotypes.Sizes.Sizeof(b.Type)), b.Type)
+	c.mov(src, b.Addr, int(src.Size()), int(gotypes.Sizes.Sizeof(b.Type)), b.Type)
 }
 
 // Dereference loads a pointer and returns its element type.