build: On Android, disable LTO for specific targets only when targeting GCC.

build/android/increase_size_for_speed.gypi

Index: build/android/increase_size_for_speed.gypi
diff --git a/build/android/increase_size_for_speed.gypi b/build/android/increase_size_for_speed.gypi
index 48d17f5f19c1423873274d10f96c153dcd5426b5..c5600b1b1a8d2f3de1eddbf0ba7dc753c76fc45c 100644
--- a/build/android/increase_size_for_speed.gypi
+++ b/build/android/increase_size_for_speed.gypi
@@ -18,17 +18,17 @@
               'cflags!': ['-Os'],
               'cflags': ['-O2'],
             }],
-            # Do not merge -Os and -O2 in LTO.
+            # Do not merge -Os and -O2 in GCC LTO.
             # LTO merges all optimization options at link-time. -O2 takes
             # precedence over -Os. Avoid using LTO simultaneously
             # on -Os and -O2 parts for that reason.
-            ['OS=="android" and use_lto==1', {
+            ['OS=="android" and clang==0 and use_lto==1', {
               'cflags!': [
                 '-flto',
                 '-ffat-lto-objects',
               ],
             }],
-            ['OS=="android" and use_lto_o2==1', {
+            ['OS=="android" and clang==0 and use_lto_o2==1', {
               'cflags': [
                 '-flto',
                 '-ffat-lto-objects',