Replace u128 with u64 in large_enum_variant uitest

A u128 has an 8 byte alignment on x86, but a 16 byte alignment on
aarch64 which changes the size of the enums due to extra padding

Author: Alexendoo

tests/ui/large_enum_variant.rs

@@ -101,12 +101,12 @@ struct Struct2 {
 #[derive(Copy, Clone)]
 enum CopyableLargeEnum {
     A(bool),
-    B([u128; 4000]),
+    B([u64; 8000]),
 }
 
 enum ManuallyCopyLargeEnum {
     A(bool),
-    B([u128; 4000]),
+    B([u64; 8000]),
 }
 
 impl Clone for ManuallyCopyLargeEnum {

tests/ui/large_enum_variant.stderr

@@ -167,8 +167,8 @@ error: large size difference between variants
 LL | / enum CopyableLargeEnum {
 LL | |     A(bool),
    | |     ------- the second-largest variant contains at least 1 bytes
-LL | |     B([u128; 4000]),
-   | |     --------------- the largest variant contains at least 64000 bytes
+LL | |     B([u64; 8000]),
+   | |     -------------- the largest variant contains at least 64000 bytes
 LL | | }
    | |_^ the entire enum is at least 64008 bytes
    |
@@ -180,17 +180,17 @@ LL | enum CopyableLargeEnum {
 help: consider boxing the large fields to reduce the total size of the enum
   --> $DIR/large_enum_variant.rs:104:5
    |
-LL |     B([u128; 4000]),
-   |     ^^^^^^^^^^^^^^^
+LL |     B([u64; 8000]),
+   |     ^^^^^^^^^^^^^^
 
 error: large size difference between variants
   --> $DIR/large_enum_variant.rs:107:1
    |
 LL | / enum ManuallyCopyLargeEnum {
 LL | |     A(bool),
    | |     ------- the second-largest variant contains at least 1 bytes
-LL | |     B([u128; 4000]),
-   | |     --------------- the largest variant contains at least 64000 bytes
+LL | |     B([u64; 8000]),
+   | |     -------------- the largest variant contains at least 64000 bytes
 LL | | }
    | |_^ the entire enum is at least 64008 bytes
    |
@@ -202,8 +202,8 @@ LL | enum ManuallyCopyLargeEnum {
 help: consider boxing the large fields to reduce the total size of the enum
   --> $DIR/large_enum_variant.rs:109:5
    |
-LL |     B([u128; 4000]),
-   |     ^^^^^^^^^^^^^^^
+LL |     B([u64; 8000]),
+   |     ^^^^^^^^^^^^^^
 
 error: large size difference between variants
   --> $DIR/large_enum_variant.rs:120:1