Replace malloc_not_svelte with malloc_low_memory.

The malloc_not_svelte variable name is confusing and makes the
low memory config the default. Change this so that the default is
the regular allocator, and that Malloc_low_memory is used to enable
the low memory allocator.

Update blueprint rules so that scudo is the default action.

Test: Verified scudo config is used by default.
Test: Verfified Android GO config uses the jemalloc low memory config.
Change-Id: Ie7b4b005a6377e2a031bbae979d66b50c8b3bcdb

debuggerd/Android.bp

@@ -240,11 +240,16 @@ cc_library_static {
         "libdebuggerd/backtrace.cpp",
         "libdebuggerd/gwp_asan.cpp",
         "libdebuggerd/open_files_list.cpp",
+        "libdebuggerd/scudo.cpp",
         "libdebuggerd/tombstone.cpp",
         "libdebuggerd/tombstone_proto.cpp",
         "libdebuggerd/utility.cpp",
     ],
 
+    cflags: [
+        "-DUSE_SCUDO",
+    ],
+
     local_include_dirs: ["libdebuggerd/include"],
     export_include_dirs: ["libdebuggerd/include"],
 
@@ -256,6 +261,7 @@ cc_library_static {
         "bionic_libc_platform_headers",
         "gwp_asan_headers",
         "liblog_headers",
+        "scudo_headers",
     ],
 
     static_libs: [
@@ -273,6 +279,7 @@ cc_library_static {
         "libtombstone_proto",
         "libprocinfo",
         "libprotobuf-cpp-lite",
+        "libscudo",
     ],
 
     target: {
@@ -312,11 +319,9 @@ cc_library_static {
             cflags: ["-DROOT_POSSIBLE"],
         },
 
-        malloc_not_svelte: {
-            cflags: ["-DUSE_SCUDO"],
-            whole_static_libs: ["libscudo"],
-            srcs: ["libdebuggerd/scudo.cpp"],
-            header_libs: ["scudo_headers"],
+        malloc_low_memory: {
+            cflags: ["-UUSE_SCUDO"],
+            exclude_static_libs: ["libscudo"],
         },
     },
     apex_available: [

debuggerd/libdebuggerd/include/libdebuggerd/scudo.h

@@ -16,6 +16,8 @@
 
 #pragma once
 
+#if defined(USE_SCUDO)
+
 #include "types.h"
 #include "utility.h"
 
@@ -49,3 +51,5 @@ class ScudoCrashData {
   void FillInCause(Cause* cause, const scudo_error_report* report,
                    unwindstack::AndroidUnwinder* unwinder) const;
 };
+
+#endif  // USE_SCUDO

debuggerd/libdebuggerd/scudo.cpp

@@ -14,6 +14,8 @@
  * limitations under the License.
  */
 
+#if defined(USE_SCUDO)
+
 #include "libdebuggerd/scudo.h"
 #include "libdebuggerd/tombstone.h"
 
@@ -141,3 +143,5 @@ void ScudoCrashData::AddCauseProtos(Tombstone* tombstone,
     FillInCause(tombstone->add_causes(), &error_info_.reports[report_num++], unwinder);
   }
 }
+
+#endif  // USE_SCUDO