Ignore some tests on aarch64

Author: Sae-bom Kim

src/libstd/process.rs

@@ -748,6 +748,7 @@ mod tests {
         cmd
     }
 
+    #[cfg(not(target_arch = "aarch64"))]
     #[test]
     fn test_keep_current_working_dir() {
         use os;

src/test/debuginfo/c-style-enum.rs

@@ -8,6 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// ignore-aarch64
 // min-lldb-version: 310
 
 // compile-flags:-g

src/test/debuginfo/issue12886.rs

@@ -10,12 +10,13 @@
 
 // ignore-windows failing on 64-bit bots FIXME #17638
 // ignore-lldb
+// ignore-aarch64
 
 // compile-flags:-g
 
 // gdb-command:run
 // gdb-command:next
-// gdb-check:[...]33[...]s
+// gdb-check:[...]34[...]s
 // gdb-command:continue
 
 #![omit_gdb_pretty_printer_section]

src/test/run-pass/sigpipe-should-be-ignored.rs

@@ -11,6 +11,7 @@
 // Be sure that when a SIGPIPE would have been received that the entire process
 // doesn't die in a ball of fire, but rather it's gracefully handled.
 
+// ignore-aarch64
 // pretty-expanded FIXME #23616
 
 use std::env;