[compiler-rt][test] Add REQUIRES: shell in tests that use the ulimit command (#105339)

This patch adds the `REQUIRES: shell` directive to six test files that
use the `ulimit` command, ensuring these tests are only run in
environments where a full POSIX-compliant shell is available. The lit
internal shell does not use or support the `ulimit` command, which
causes failures when running tests with `LIT_USE_INTERNAL_SHELL=1 ninja
check-compiler-rt`
Specifically, one of the errors encountered is: 
```
# RUN: at line 4
ulimit -s 1000
# executed command: ulimit -s 1000
# .---command stderr------------
# | 'ulimit': command not found
# `-----------------------------
# error: command failed with exit status: 127
```
Since, the lit internal shell doesn't support `ulimit`, adding this
requirement prevents these tests from failing in the lit internal shell,
thereby improving the reliability of the test suite in environments
where the full shell is not available.

This change is relevant for [[RFC] Enabling the Lit Internal Shell by
Default](https://discourse.llvm.org/t/rfc-enabling-the-lit-internal-shell-by-default/80179/3)
fixes:  #102398

Author: Harini0924

compiler-rt/test/asan/TestCases/Linux/allocator_oom_test.cpp

@@ -31,7 +31,7 @@
 // ASan shadow memory on s390 is too large for this test.
 // AArch64 bots fail on this test.
 // TODO(alekseys): Android lit do not run ulimit on device.
-// REQUIRES: shadow-scale-3
+// REQUIRES: shell, shadow-scale-3
 // UNSUPPORTED: android, target={{(s390|aarch64|powerpc64le).*}}
 
 #include <stdlib.h>

compiler-rt/test/asan/TestCases/Posix/deep_call_stack.cpp

@@ -1,4 +1,5 @@
 // Check that UAR mode can handle very deep recusrion.
+// REQUIRES: shell
 // RUN: %clangxx_asan -O2 %s -o %t
 // RUN: ulimit -s 4096
 // RUN: %env_asan_opts=detect_stack_use_after_return=1 %run %t 2>&1 | FileCheck %s

compiler-rt/test/fuzzer/merge-posix.test

@@ -1,5 +1,5 @@
+REQUIRES: shell
 XFAIL: ios
-UNSUPPORTED: target={{.*windows.*}}
 RUN: %cpp_compiler %S/FullCoverageSetTest.cpp -o %t-FullCoverageSetTest
 
 RUN: rm -rf  %tmp/T1 %tmp/T2

compiler-rt/test/fuzzer/ulimit.test

@@ -1,5 +1,4 @@
-# FIXME: Disabled on Windows for now because Windows has no ulimit command.
-UNSUPPORTED: target={{.*windows.*}}
+REQUIRES: shell
 RUN: %cpp_compiler %S/SimpleTest.cpp -o %t-SimpleTest
 RUN: ulimit -s 1000
 RUN: not %run %t-SimpleTest

compiler-rt/test/hwasan/TestCases/print-memory-usage.c

@@ -1,4 +1,5 @@
 // Tests __hwasan_print_memory_usage.
+// REQUIRES: shell
 // RUN: %clang_hwasan %s -o %t
 // RUN: ulimit -s 1000
 // RUN: %run %t 2>&1 | FileCheck %s

compiler-rt/test/msan/Linux/reexec_unlimited_stack.cpp

@@ -1,5 +1,6 @@
 // MSAN re-execs on unlimited stacks. We use that to verify ReExec() uses the
 // right path.
+// REQUIRES: shell
 // RUN: %clangxx_msan -O0 %s -o %t && ulimit -s unlimited && %run %t | FileCheck %s
 
 #include <stdio.h>