Revert "_FORTIFY_SOURCE: simplify memset() fortification."

This reverts commit e12357bcfc5a9b03cd35c49fe88d1407bb749f2f.

Reason for revert: Droidmonitor created revert due to b/399907832. Will be verifying through ABTD before submission

Change-Id: I03855951ee226a40691db68c0b7372b56546d4af
diff --git a/tests/Android.bp b/tests/Android.bp
index 804884a..51afa55 100644
--- a/tests/Android.bp
+++ b/tests/Android.bp
@@ -636,6 +636,7 @@
         "-Wno-format-security",
         "-Wno-format-zero-length",
         "-Wno-fortify-source",
+        "-Wno-memset-transposed-args",
         "-Wno-strlcpy-strlcat-size",
         "-Wno-strncat-size",
     ],
diff --git a/tests/clang_fortify_tests.cpp b/tests/clang_fortify_tests.cpp
index 0b2985d..da7926d 100644
--- a/tests/clang_fortify_tests.cpp
+++ b/tests/clang_fortify_tests.cpp
@@ -170,10 +170,8 @@
     EXPECT_FORTIFY_DEATH(mempcpy(small_buffer, large_buffer, sizeof(large_buffer)));
     // expected-error@+1{{will always overflow}}
     EXPECT_FORTIFY_DEATH(memset(small_buffer, 0, sizeof(large_buffer)));
-#ifdef COMPILATION_TESTS
-    // expected-error@+1{{did you mean to transpose the last two arguments?}}
-    memset(small_buffer, sizeof(small_buffer), 0);
-#endif
+    // expected-warning@+1{{arguments got flipped?}}
+    EXPECT_NO_DEATH(memset(small_buffer, sizeof(small_buffer), 0));
     // expected-error@+1{{size bigger than buffer}}
     EXPECT_FORTIFY_DEATH(bcopy(large_buffer, small_buffer, sizeof(large_buffer)));
     // expected-error@+1{{size bigger than buffer}}