Ignore more failing ui tests in GCC backend

tests/ui/abi/homogenous-floats-target-feature-mixup.rs

@@ -6,6 +6,7 @@
 
 //@ run-pass
 //@ needs-subprocess
+//@ ignore-backends: gcc
 
 #![allow(overflowing_literals)]
 #![allow(unused_variables)]

tests/ui/abi/segfault-no-out-of-stack.rs

@@ -2,6 +2,7 @@
 //@ needs-subprocess
 //@ compile-flags: -Zub-checks=no -Zmir-enable-passes=-CheckNull
 //@ ignore-fuchsia must translate zircon signal to SIGSEGV/SIGBUS, FIXME (#58590)
+//@ ignore-backends: gcc
 
 #![feature(rustc_private)]
 

tests/ui/process/process-panic-after-fork.rs

@@ -5,6 +5,7 @@
 //@ ignore-fuchsia no fork
 //@ ignore-tvos fork is prohibited
 //@ ignore-watchos fork is prohibited
+//@ ignore-backends: gcc
 
 #![feature(rustc_private)]
 #![feature(never_type)]

tests/ui/sanitizer/address.rs

@@ -7,6 +7,7 @@
 //@ run-fail-or-crash
 //@ error-pattern: AddressSanitizer: stack-buffer-overflow
 //@ error-pattern: 'xs' (line 14) <== Memory access at offset
+//@ ignore-backends: gcc
 
 use std::hint::black_box;
 

tests/ui/sanitizer/dataflow.rs

@@ -5,6 +5,7 @@
 //@ needs-sanitizer-dataflow
 //@ run-pass
 //@ compile-flags: -Zsanitizer=dataflow -Zsanitizer-dataflow-abilist={{src-base}}/sanitizer/dataflow-abilist.txt -C unsafe-allow-abi-mismatch=sanitizer
+//@ ignore-backends: gcc
 
 use std::mem::size_of;
 use std::os::raw::{c_int, c_long, c_void};

tests/ui/sanitizer/memory-eager.rs

@@ -12,6 +12,7 @@
 //@ error-pattern: MemorySanitizer: use-of-uninitialized-value
 //@ [optimized]error-pattern: Uninitialized value was created by an allocation
 //@ [optimized]error-pattern: in the stack frame
+//@ ignore-backends: gcc
 //
 // FIXME the unoptimized case actually has that text in the output too, per
 // <https://github.com/rust-lang/rust/pull/138759#issuecomment-3037186707>

tests/ui/sanitizer/memory.rs

@@ -12,6 +12,7 @@
 //@ error-pattern: MemorySanitizer: use-of-uninitialized-value
 //@ error-pattern: Uninitialized value was created by an allocation
 //@ error-pattern: in the stack frame
+//@ ignore-backends: gcc
 //
 // This test case intentionally limits the usage of the std,
 // since it will be linked with an uninstrumented version of it.

tests/ui/sanitizer/new-llvm-pass-manager-thin-lto.rs

@@ -15,6 +15,7 @@
 //@[opt1]compile-flags: -Copt-level=1
 //@ run-fail-or-crash
 //@ error-pattern: ERROR: AddressSanitizer: stack-use-after-scope
+//@ ignore-backends: gcc
 
 static mut P: *mut usize = std::ptr::null_mut();
 

tests/ui/sanitizer/thread.rs

@@ -19,6 +19,7 @@
 //@ error-pattern: WARNING: ThreadSanitizer: data race
 //@ error-pattern: Location is heap block of size 4
 //@ error-pattern: allocated by main thread
+//@ ignore-backends: gcc
 
 #![feature(rustc_private)]
 extern crate libc;

tests/ui/sanitizer/use-after-scope.rs

@@ -5,6 +5,7 @@
 //@ compile-flags: -Zsanitizer=address -C unsafe-allow-abi-mismatch=sanitizer
 //@ run-fail-or-crash
 //@ error-pattern: ERROR: AddressSanitizer: stack-use-after-scope
+//@ ignore-backends: gcc
 
 static mut P: *mut usize = std::ptr::null_mut();
 

tests/ui/simd/target-feature-mixup.rs

@@ -5,6 +5,7 @@
 
 //@ needs-subprocess
 //@ ignore-fuchsia must translate zircon signal to SIGILL, FIXME (#58590)
+//@ ignore-backends: gcc
 
 #![feature(repr_simd, target_feature, cfg_target_feature)]