Don't use ashmen when kIsTargetLinux is set.

Test: get JIT enabled when running ART.
Change-Id: Ic1c351601d8e85ba6597c3b400fa0094e070a56a
diff --git a/runtime/mem_map.cc b/runtime/mem_map.cc
index 1ec59b3..6da72e4 100644
--- a/runtime/mem_map.cc
+++ b/runtime/mem_map.cc
@@ -282,6 +282,7 @@
 #ifndef __LP64__
   UNUSED(low_4gb);
 #endif
+  use_ashmem = use_ashmem && !kIsTargetLinux;
   if (byte_count == 0) {
     return new MemMap(name, nullptr, 0, nullptr, 0, prot, false);
   }
@@ -522,6 +523,7 @@
 
 MemMap* MemMap::RemapAtEnd(uint8_t* new_end, const char* tail_name, int tail_prot,
                            std::string* error_msg, bool use_ashmem) {
+  use_ashmem = use_ashmem && !kIsTargetLinux;
   DCHECK_GE(new_end, Begin());
   DCHECK_LE(new_end, End());
   DCHECK_LE(begin_ + size_, reinterpret_cast<uint8_t*>(base_begin_) + base_size_);