[PowerPC] Mark allocator_oom_test.cpp unsupported on PowerPC

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.

Reviewed By: #powerpc, nemanjai

Differential Revision: https://reviews.llvm.org/D84786

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

@@ -32,7 +32,7 @@
 // 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>