fmt: Assume that we'll only ever see 32 or 64 bit pointers

src/libcore/fmt/mod.rs

@@ -861,8 +861,7 @@ fn fmt(&self, f: &mut Formatter) -> Result {
                 // The formats need two extra bytes, for the 0x
                 if cfg!(target_pointer_width = "32") {
                     f.width = Some(10);
-                }
-                if cfg!(target_pointer_width = "64") {
+                } else {
                     f.width = Some(18);
                 }
             }

src/test/run-pass/fmt-pointer-trait.rs

@@ -26,8 +26,7 @@ fn main() {
     if cfg!(target_pointer_width = "32") {
         assert_eq!(format!("{:#p}", p),
                    "0x00000000");
-    }
-    if cfg!(target_pointer_width = "64") {
+    } else {
         assert_eq!(format!("{:#p}", p),
                    "0x0000000000000000");
     }

src/test/run-pass/ifmt.rs

@@ -75,8 +75,7 @@ pub fn main() {
     if cfg!(target_pointer_width = "32") {
         t!(format!("{:#p}", 0x1234 as *const isize), "0x00001234");
         t!(format!("{:#p}", 0x1234 as *mut isize), "0x00001234");
-    }
-    if cfg!(target_pointer_width = "64") {
+    } else {
         t!(format!("{:#p}", 0x1234 as *const isize), "0x0000000000001234");
         t!(format!("{:#p}", 0x1234 as *mut isize), "0x0000000000001234");
     }