Non-SFI NaCl: Fix browser_tests based on libc_free.c

chrome/test/data/nacl/nacl_test_data.gyp

Index: chrome/test/data/nacl/nacl_test_data.gyp
diff --git a/chrome/test/data/nacl/nacl_test_data.gyp b/chrome/test/data/nacl/nacl_test_data.gyp
index ea5e198cde0f3a5b8971e9d2d0648e2fef286092..71272360e2b5c6857c054c63adfca76b41757808 100644
--- a/chrome/test/data/nacl/nacl_test_data.gyp
+++ b/chrome/test/data/nacl/nacl_test_data.gyp
@@ -1139,6 +1139,11 @@
 
             # Stack-Smashing protector does not work with libc-free context.
             '-fno-stack-protector',
+            # Optimizers may translate the original code to code which
+            # requires builtin functions and/or relocations. Specifically,
+            # the LLVM's optimizer translates for-loop based zero
+            # clear to memset.
+            '-O0',
           ],
           'cflags!': [
             # We filter these out because release_extra_cflags or another
@@ -1148,10 +1153,14 @@
             '-fstack-protector-all',
             '-fprofile-generate',
             '-finstrument-functions',
+            '-O2',
           ],
           'ldflags': [
             '-nostdlib',
             '-shared',
+            # This binary cannot relocate itself, so we should have no
+            # undefined references left.
+            '-Wl,--no-undefined',
           ],
           'ldflags!': [
             # Explicitly remove the -pthread flag to avoid a link time warning.