- // MIR for `constant_index_overflow` before GVN
+ // MIR for `constant_index_overflow` after GVN
  
  fn constant_index_overflow(_1: &[T]) -> () {
      debug x => _1;
      let mut _0: ();
      let _2: usize;
      let mut _4: bool;
      let mut _5: usize;
      let mut _6: usize;
      let mut _7: &[T];
      let _8: usize;
      let mut _9: usize;
      let mut _10: bool;
      let _11: usize;
      let mut _12: usize;
      let mut _13: bool;
      let mut _14: T;
      scope 1 {
          debug a => _2;
          let _3: T;
          scope 2 {
              debug b => _3;
          }
      }
  
      bb0: {
-         StorageLive(_2);
-         _2 = const _ as usize (IntToInt);
+         nop;
+         _2 = const usize::MAX;
          StorageLive(_3);
          StorageLive(_4);
          StorageLive(_5);
-         _5 = _2;
+         _5 = const usize::MAX;
          StorageLive(_6);
          StorageLive(_7);
          _7 = &(*_1);
          _6 = core::slice::<impl [T]>::len(move _7) -> [return: bb1, unwind continue];
      }
  
      bb1: {
          StorageDead(_7);
-         _4 = Lt(move _5, move _6);
+         _4 = Lt(const usize::MAX, move _6);
          switchInt(move _4) -> [0: bb4, otherwise: bb2];
      }
  
      bb2: {
          StorageDead(_6);
          StorageDead(_5);
          StorageLive(_8);
-         _8 = _2;
+         _8 = const usize::MAX;
          _9 = Len((*_1));
-         _10 = Lt(_8, _9);
-         assert(move _10, "index out of bounds: the length is {} but the index is {}", move _9, _8) -> [success: bb3, unwind continue];
+         _10 = Lt(const usize::MAX, _9);
+         assert(move _10, "index out of bounds: the length is {} but the index is {}", move _9, const usize::MAX) -> [success: bb3, unwind continue];
      }
  
      bb3: {
-         _3 = (*_1)[_8];
+         _3 = (*_1)[_2];
          StorageDead(_8);
          goto -> bb6;
      }
  
      bb4: {
          StorageDead(_6);
          StorageDead(_5);
          StorageLive(_11);
          _11 = const 0_usize;
          _12 = Len((*_1));
-         _13 = Lt(_11, _12);
-         assert(move _13, "index out of bounds: the length is {} but the index is {}", move _12, _11) -> [success: bb5, unwind continue];
+         _13 = Lt(const 0_usize, _12);
+         assert(move _13, "index out of bounds: the length is {} but the index is {}", move _12, const 0_usize) -> [success: bb5, unwind continue];
      }
  
      bb5: {
-         _3 = (*_1)[_11];
+         _3 = (*_1)[0 of 1];
          StorageDead(_11);
          goto -> bb6;
      }
  
      bb6: {
          StorageDead(_4);
          StorageLive(_14);
          _14 = _3;
          _0 = opaque::<T>(move _14) -> [return: bb7, unwind continue];
      }
  
      bb7: {
          StorageDead(_14);
          StorageDead(_3);
-         StorageDead(_2);
+         nop;
          return;
      }
  }