ignore/fix layout-sensitive tests

tests/codegen/issues/issue-86106.rs

@@ -1,5 +1,6 @@
 //@ only-64bit llvm appears to use stores instead of memset on 32bit
 //@ compile-flags: -C opt-level=3 -Z merge-functions=disabled
+//@ needs-deterministic-layouts
 
 // The below two functions ensure that both `String::new()` and `"".to_string()`
 // produce the identical code.

tests/codegen/mem-replace-big-type.rs

@@ -5,6 +5,7 @@
 
 //@ compile-flags: -C no-prepopulate-passes -Zinline-mir=no
 //@ ignore-debug: precondition checks in ptr::read make them a bad candidate for MIR inlining
+//@ needs-deterministic-layouts
 
 #![crate_type = "lib"]
 

tests/codegen/slice-iter-nonnull.rs

@@ -1,4 +1,5 @@
 //@ compile-flags: -O
+//@ needs-deterministic-layouts
 #![crate_type = "lib"]
 #![feature(exact_size_is_empty)]
 

tests/codegen/vecdeque-drain.rs

@@ -1,6 +1,7 @@
 // Check that draining at the front or back doesn't copy memory.
 
 //@ compile-flags: -O
+//@ needs-deterministic-layouts
 //@ ignore-debug: FIXME: checks for call detect scoped noalias metadata
 
 #![crate_type = "lib"]

tests/mir-opt/pre-codegen/issue_117368_print_invalid_constant.rs

@@ -1,3 +1,4 @@
+//@needs-deterministic-layouts
 // Verify that we do not ICE when printing an invalid constant.
 // EMIT_MIR_FOR_EACH_BIT_WIDTH
 // EMIT_MIR_FOR_EACH_PANIC_STRATEGY

tests/ui/stats/hir-stats.rs

@@ -1,12 +1,15 @@
 //@ check-pass
 //@ compile-flags: -Zhir-stats
 //@ only-x86_64
+// layout randomization affects the hir stat output
+//@ needs-deterministic-layouts
 
 // Type layouts sometimes change. When that happens, until the next bootstrap
 // bump occurs, stage1 and stage2 will give different outputs for this test.
 // Add an `ignore-stage1` comment marker to work around that problem during
 // that time.
 
+
 // The aim here is to include at least one of every different type of top-level
 // AST/HIR node reported by `-Zhir-stats`.
 

tests/ui/structs-enums/type-sizes.rs

@@ -1,4 +1,5 @@
 //@ run-pass
+//@ needs-deterministic-layouts
 
 #![allow(non_camel_case_types)]
 #![allow(dead_code)]