[lsan] Disable sem_init_glibc.cc testcase for LSan x86.

This test relies on sanitizer common interceptor to pick the oldest version of
sem_init function from Glibc. But LSan actually doesn't intercept sem_init, thus
the new implementation is called that causes test failure. Disable it for LSan x86,
the proper fix would require to check Glibc version at runtime and adjust
GET_SEM_VALUE(V) accordingly. 

llvm-svn: 294001

compiler-rt/test/sanitizer_common/TestCases/Linux/sem_init_glibc.cc

@@ -1,7 +1,7 @@
 // RUN: %clangxx -O0 -g %s -lutil -o %t && %run %t
 // This test depends on the glibc layout of struct sem_t and checks that we
 // don't leave sem_t::private uninitialized.
-// UNSUPPORTED: android
+// UNSUPPORTED: android, lsan-x86
 #include <features.h>
 #include <assert.h>
 #include <semaphore.h>