Auto merge of #147886 - dianqk:gvn-new-deref-arg, r=<try>

GVN: Use the borrows only if they are always live

Author: rust-bors[bot]

compiler/rustc_middle/src/mir/terminator.rs

@@ -696,28 +696,6 @@ impl<'tcx> TerminatorKind<'tcx> {
             _ => None,
         }
     }
-
-    /// Returns true if the terminator can write to memory.
-    pub fn can_write_to_memory(&self) -> bool {
-        match self {
-            TerminatorKind::Goto { .. }
-            | TerminatorKind::SwitchInt { .. }
-            | TerminatorKind::UnwindResume
-            | TerminatorKind::UnwindTerminate(_)
-            | TerminatorKind::Return
-            | TerminatorKind::Assert { .. }
-            | TerminatorKind::CoroutineDrop
-            | TerminatorKind::FalseEdge { .. }
-            | TerminatorKind::FalseUnwind { .. }
-            | TerminatorKind::Unreachable => false,
-            TerminatorKind::Call { .. }
-            | TerminatorKind::Drop { .. }
-            | TerminatorKind::TailCall { .. }
-            // Yield writes to the resume_arg place.
-            | TerminatorKind::Yield { .. }
-            | TerminatorKind::InlineAsm { .. } => true,
-        }
-    }
 }
 
 #[derive(Copy, Clone, Debug)]