Make memory exhaustion a hard error

Author: syvb

compiler/rustc_middle/src/mir/interpret/error.rs

@@ -530,7 +530,8 @@ impl InterpError<'_> {
         use InterpError::*;
         match *self {
             MachineStop(ref err) => err.is_hard_err(),
-            InterpError::UndefinedBehavior(_) => true,
+            UndefinedBehavior(_) => true,
+            ResourceExhaustion(ResourceExhaustionInfo::MemoryExhausted) => true,
             _ => false,
         }
     }

src/test/ui/consts/large_const_alloc.rs

@@ -4,8 +4,7 @@
 const FOO: () = {
     // 128 TiB, unlikely anyone has that much RAM
     let x = [0_u8; (1 << 47) - 1];
-    //~^ ERROR any use of this value will cause an error
-    //~| WARNING this was previously accepted by the compiler but is being phased out
+    //~^ ERROR evaluation of constant value failed
 };
 
 fn main() {

src/test/ui/consts/large_const_alloc.stderr

@@ -1,18 +1,9 @@
-error: any use of this value will cause an error
+error[E0080]: evaluation of constant value failed
   --> $DIR/large_const_alloc.rs:6:13
    |
-LL | / const FOO: () = {
-LL | |     // 128 TiB, unlikely anyone has that much RAM
-LL | |     let x = [0_u8; (1 << 47) - 1];
-   | |             ^^^^^^^^^^^^^^^^^^^^^ tried to allocate more memory than available to compiler
-LL | |
-LL | |
-LL | | };
-   | |__-
-   |
-   = note: `#[deny(const_err)]` on by default
-   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
-   = note: for more information, see issue #71800 <https://github.com/rust-lang/rust/issues/71800>
+LL |     let x = [0_u8; (1 << 47) - 1];
+   |             ^^^^^^^^^^^^^^^^^^^^^ tried to allocate more memory than available to compiler
 
 error: aborting due to previous error
 
+For more information about this error, try `rustc --explain E0080`.