[llvm-lit] Add REQUIRES: shell in tests that use the ulimit command

Added REQUIRES: shell in 6 files that use the ulimit command because lit
internal shell doesn't support this command.

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

@@ -1,3 +1,4 @@
+// REQUIRES: shell
 // Check that UAR mode can handle very deep recusrion.
 // RUN: %clangxx_asan -O2 %s -o %t
 // RUN: ulimit -s 4096

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

@@ -1,3 +1,4 @@
+REQUIRES: shell
 XFAIL: ios
 UNSUPPORTED: target={{.*windows.*}}
 RUN: %cpp_compiler %S/FullCoverageSetTest.cpp -o %t-FullCoverageSetTest

compiler-rt/test/fuzzer/ulimit.test

@@ -1,4 +1,5 @@
 # FIXME: Disabled on Windows for now because Windows has no ulimit command.
+REQUIRES: shell
 UNSUPPORTED: target={{.*windows.*}}
 RUN: %cpp_compiler %S/SimpleTest.cpp -o %t-SimpleTest
 RUN: ulimit -s 1000

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

@@ -1,3 +1,4 @@
+// REQUIRES: shell
 // Tests __hwasan_print_memory_usage.
 // RUN: %clang_hwasan %s -o %t
 // RUN: ulimit -s 1000

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

@@ -1,3 +1,4 @@
+// REQUIRES: shell
 // MSAN re-execs on unlimited stacks. We use that to verify ReExec() uses the
 // right path.
 // RUN: %clangxx_msan -O0 %s -o %t && ulimit -s unlimited && %run %t | FileCheck %s