Fixes to compile-fail error messages post-rebase.

Author: pnkfelix

src/test/compile-fail/const-eval-overflow-3.rs

@@ -22,7 +22,8 @@ use std::{u8, u16, u32, u64, usize};
 const A_I8_I
     : [u32; (i8::MAX as usize) + 1]
     = [0; (i8::MAX + 1) as usize];
-//~^ ERROR error evaluating count: attempted to add with overflow
+//~^ ERROR mismatched types
+//~| ERROR expected constant integer for repeat count, but attempted to add with overflow
 
 fn main() {
     foo(&A_I8_I[..]);

src/test/compile-fail/const-eval-overflow-3b.rs

@@ -27,6 +27,10 @@ const A_I8_I
     : [u32; (i8::MAX as usize) + 1]
     = [0; (i8::MAX + 1u8) as usize];
 //~^ ERROR mismatched types
+//~| ERROR mismatched types
+//~| ERROR expected constant integer for repeat count, but attempted to add with overflow
+//~| ERROR the trait `core::ops::Add<u8>` is not implemented for the type `i8`
+//~| ERROR the trait `core::ops::Add<u8>` is not implemented for the type `i8`
 
 fn main() {
     foo(&A_I8_I[..]);

src/test/compile-fail/const-eval-overflow-4b.rs

@@ -22,6 +22,8 @@ use std::{u8, u16, u32, u64, usize};
 const A_I8_T
     : [u32; (i8::MAX as i8 + 1u8) as usize]
     //~^ ERROR mismatched types
+    //~| the trait `core::ops::Add<u8>` is not implemented for the type `i8`
+    //~| the trait `core::ops::Add<u8>` is not implemented for the type `i8`
     = [0; (i8::MAX as usize) + 1];
 
 fn main() {

src/test/compile-fail/huge-array-simple.rs

@@ -8,9 +8,11 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-// error-pattern: too big for the current
 #![allow(exceeding_bitshifts)]
 
 fn main() {
-   let fat : [u8; (1<<61)+(1<<31)] = [0; (1u64<<61) as usize +(1u64<<31) as usize];
+    let fat : [u8; (1<<61)+(1<<31)] =
+        //~^ ERROR array length constant evaluation error: attempted left shift with overflow
+        [0; (1u64<<61) as usize +(1u64<<31) as usize];
+    //~^ ERROR expected constant integer for repeat count, but attempted left shift with overflow
 }