Auto merge of #148093 - Azzybana:master, r=nnethercote

perf: removed unnecessary let for return only in layout.rs perf: removed unnecessary let for return only

Author: bors

library/core/src/alloc/layout.rs

@@ -316,8 +316,7 @@ impl Layout {
  // Size 1 Align MAX or Size isize::MAX Align 2 round up to `isize::MAX + 1`.)
  unsafe {
  let align_m1 = unchecked_sub(align.as_usize(), 1);
- let size_rounded_up = unchecked_add(self.size, align_m1) & !align_m1;
- size_rounded_up
+ unchecked_add(self.size, align_m1) & !align_m1
  }
  }