[PowerPC] Mark allocator_oom_test.cpp unsupported on PowerPC

[saghir]

Summary

This patch marks compiler-rt/test/asan/TestCases/Linux/allocator_oom_test.cpp
unsupported on PowerPC 64bit-LE architecture since this test fails when run
on a machine with larger system memory.

[nemanjai]

LGTM. Thank you.

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

 // RUN:   | FileCheck %s --check-prefixes=CHECK-MALLOC-REALLOC,CHECK-CRASH
 // RUN: %env_asan_opts=allocator_may_return_null=1     %run %t realloc-after-malloc 2>&1 \
 // RUN:   | FileCheck %s --check-prefixes=CHECK-MALLOC-REALLOC,CHECK-NULL
 
 // 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
-// UNSUPPORTED: s390,android,aarch64
+// UNSUPPORTED: s390,android,aarch64,powerpc64le
 
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
 #include <assert.h>
 
 int main(int argc, char **argv) {
   assert(argc == 2);