Inline successor_within_block.

compiler/rustc_middle/src/mir/mod.rs

@@ -1568,6 +1568,7 @@ impl Location {
     ///
     /// Note that if this location represents a terminator, then the
     /// resulting location would be out of bounds and invalid.
+    #[inline]
     pub fn successor_within_block(&self) -> Location {
         Location { block: self.block, statement_index: self.statement_index + 1 }
     }