Hide most symbols in libmemunreachable

In preparation for making libmemunreachble vendor_available, hide
everything but the public ABI using a version script.  The unit
tests now have to compile statically against libmemunreachable,
so split out the tests that run against the public API into a
separate test.

Bug: 132302484
Test: atest memunreachable_test memunreachable_unit_test
Change-Id: Ie9dec073fdeee342776566abedd50f7498476eca

TEST_MAPPING

@@ -27,6 +27,13 @@
     {
       "name": "memunreachable_test"
     },
+    {
+      "name": "memunreachable_unit_test"
+    },
+    {
+      "name": "memunreachable_unit_test",
+      "host": true
+    },
     {
       "name": "memunreachable_binder_test"
     },

libmemunreachable/Android.bp

@@ -48,10 +48,23 @@ cc_library {
     },
     export_include_dirs: ["include"],
     local_include_dirs: ["include"],
+    version_script: "libmemunreachable.map",
+}
+
+// Integration test that runs against the public API of libmemunreachable
+cc_test {
+    name: "memunreachable_test",
+    defaults: ["libmemunreachable_defaults"],
+    srcs: [
+        "tests/MemUnreachable_test.cpp",
+    ],
+    shared_libs: ["libmemunreachable"],
+
+    test_suites: ["device-tests"],
 }
 
 cc_test {
-    name: "memunreachable_test",
+    name: "memunreachable_unit_test",
     defaults: ["libmemunreachable_defaults"],
     host_supported: true,
     srcs: [
@@ -67,8 +80,9 @@ cc_test {
                 "tests/MemUnreachable_test.cpp",
                 "tests/ThreadCapture_test.cpp",
             ],
-            shared_libs: [
+            static_libs: [
                 "libmemunreachable",
+                "libc_malloc_debug_backtrace",
             ],
         },
         host: {

libmemunreachable/libmemunreachable.map

@@ -0,0 +1,13 @@
+LIBMEMUNREACHABLE {
+  global:
+    LogUnreachableMemory;
+    NoLeaks;
+    extern "C++" {
+      android::GetUnreachableMemory*;
+      android::GetUnreachableMemoryString*;
+      android::Leak::*;
+      android::UnreachableMemoryInfo::*;
+    };
+  local:
+    *;
+};