Use -O2 instead -O3 for Android build.

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 2e3c7854d528e9182980d02f14a98958517b3019..455a144e772e35584ceb4ac20a797d23a272ca32 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -451,8 +451,7 @@
           ['v8_enable_extra_checks==1', {
             'defines': ['ENABLE_EXTRA_CHECKS',],
           }],
-          ['OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="netbsd" \
-            or OS=="android"', {
+          ['OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="netbsd"', {
             'cflags!': [
               '-O2',
               '-Os',
@@ -471,6 +470,25 @@
               }],
             ],
           }],
+          ['OS=="android"', {
+            'cflags!': [
+              '-O3',
+              '-Os',
+            ],
+            'cflags': [
+              '-fdata-sections',
+              '-ffunction-sections',
+              '-O2',
+            ],
+            'conditions': [
+              [ 'gcc_version==44 and clang==0', {
+                'cflags': [
+                  # Avoid crashes with gcc 4.4 in the v8 test suite.
+                  '-fno-tree-vrp',
+                ],
+              }],
+            ],
+          }],
           ['OS=="mac"', {
             'xcode_settings': {
               'GCC_OPTIMIZATION_LEVEL': '3',  # -O3