Revert of [turbofan] Relax effects and context for JSToNumber(x:plain-primitive).

src/compiler/js-typed-lowering.cc

Index: src/compiler/js-typed-lowering.cc
diff --git a/src/compiler/js-typed-lowering.cc b/src/compiler/js-typed-lowering.cc
index 20f33eed5e974e2c47cdc83e6265d759d99d9661..9094a662087ddb876fea4287a963d7e5ca462276 100644
--- a/src/compiler/js-typed-lowering.cc
+++ b/src/compiler/js-typed-lowering.cc
@@ -18,6 +18,7 @@
 // TODO(turbofan): js-typed-lowering improvements possible
 // - immediately put in type bounds for all new nodes
 // - relax effects from generic but not-side-effecting operations
+// - relax effects for ToNumber(mixed)
 
 
 // Relax the effects of {node} by immediately replacing effect uses of {node}
@@ -730,9 +731,6 @@
         node->ReplaceInput(i, value);
       }
       node->TrimInputCount(input_count);
-    } else {
-      // JSToNumber(x:plain-primitive,context) => JSToNumber(x,no-context)
-      node->ReplaceInput(1, jsgraph()->NoContextConstant());
     }
     return Changed(node);
   }