Remove some only- clauses from mir-opt tests

tests/mir-opt/asm_unwind_panic_abort.rs

@@ -1,9 +1,8 @@
 //! Tests that unwinding from an asm block is caught and forced to abort
 //! when `-C panic=abort`.
 
-//@ only-x86_64
 //@ compile-flags: -C panic=abort
-//@ no-prefer-dynamic
+//@ needs-asm-support
 
 #![feature(asm_unwind)]
 

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

@@ -1,7 +1,6 @@
 // skip-filecheck
 //@ compile-flags: -O -Zmir-opt-level=2 -Cdebuginfo=2
 //@ needs-unwind
-//@ only-x86_64
 
 #![crate_type = "lib"]
 #![feature(step_trait)]

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

@@ -1,6 +1,5 @@
 // skip-filecheck
 //@ compile-flags: -O -C debuginfo=0 -Zmir-opt-level=2
-//@ only-64bit
 
 // Checks that we do not have any branches in the MIR for the two tested functions.
 

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

@@ -1,7 +1,6 @@
 // skip-filecheck
 //@ compile-flags: -O -Zmir-opt-level=2 -g
 //@ needs-unwind
-//@ only-64bit
 
 #![crate_type = "lib"]
 

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

@@ -1,6 +1,5 @@
 // skip-filecheck
 //@ compile-flags: -O -C debuginfo=0 -Zmir-opt-level=2 -Zinline-mir
-//@ only-64bit
 //@ ignore-debug the standard library debug assertions leak into this test
 // EMIT_MIR_FOR_EACH_PANIC_STRATEGY
 

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

@@ -1,6 +1,5 @@
 // skip-filecheck
 //@ compile-flags: -O -C debuginfo=0 -Zmir-opt-level=2
-//@ only-64bit
 // EMIT_MIR_FOR_EACH_PANIC_STRATEGY
 
 #![crate_type = "lib"]

tests/mir-opt/pre-codegen/simple_option_map.ezmap.PreCodegen.after.mir

@@ -3,9 +3,9 @@
 fn ezmap(_1: Option<i32>) -> Option<i32> {
     debug x => _1;
     let mut _0: std::option::Option<i32>;
-    scope 1 (inlined map::<i32, i32, {closure@$DIR/simple_option_map.rs:18:12: 18:15}>) {
+    scope 1 (inlined map::<i32, i32, {closure@$DIR/simple_option_map.rs:17:12: 17:15}>) {
         debug slf => _1;
-        debug f => const ZeroSized: {closure@$DIR/simple_option_map.rs:18:12: 18:15};
+        debug f => const ZeroSized: {closure@$DIR/simple_option_map.rs:17:12: 17:15};
         let mut _2: isize;
         let _3: i32;
         let mut _4: i32;

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

@@ -1,6 +1,5 @@
 // skip-filecheck
 //@ compile-flags: -O -C debuginfo=0 -Zmir-opt-level=2
-//@ only-64bit
 
 #[inline(always)]
 fn map<T, U, F>(slf: Option<T>, f: F) -> Option<U>

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

@@ -1,6 +1,5 @@
 // skip-filecheck
 //@ compile-flags: -O -C debuginfo=0 -Zmir-opt-level=2
-//@ only-64bit
 //@ ignore-debug the standard library debug assertions leak into this test
 // EMIT_MIR_FOR_EACH_PANIC_STRATEGY
 

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

@@ -1,6 +1,5 @@
 // skip-filecheck
 //@ compile-flags: -O -C debuginfo=0 -Zmir-opt-level=2
-//@ only-64bit
 //@ ignore-debug the standard library debug assertions leak into this test
 // EMIT_MIR_FOR_EACH_PANIC_STRATEGY
 

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

@@ -1,6 +1,5 @@
 // skip-filecheck
 //@ compile-flags: -O -C debuginfo=0 -Zmir-opt-level=2
-//@ only-64bit
 
 // Track the status of MIR optimizations simplifying `Ok(res?)` for both the old and new desugarings
 // of that syntax.