Build Breakage in branch: git_master @ 2265859

Split mmap-perf into a 32 and 64-bit version.

(cherry picked from commit 03def1b807fd15bd057a437bd451fb659403907f)

Change-Id: I0b69fa9b88ee571186a2c69c56b7ef46c145370a
diff --git a/mmap-perf/unsupported.cpp b/mmap-perf/unsupported.cpp
new file mode 100644
index 0000000..77d633e
--- /dev/null
+++ b/mmap-perf/unsupported.cpp
@@ -0,0 +1,6 @@
+#include <stdio.h>
+
+int main() {
+    fprintf(stderr, "mmap-perf is unsupported for 32-bit architectures\n");
+    return -1;
+}