x86 build fix.

Remove -fkeep-inline-functions from debug builds, having it there causes
missing dependencies when we include system/core headers for the target on x86.

Change-Id: Ice5c6f0469f604efb58dfacf2ab6bb3183429850
diff --git a/build/Android.common_build.mk b/build/Android.common_build.mk
index ef97d03..0e930ee 100644
--- a/build/Android.common_build.mk
+++ b/build/Android.common_build.mk
@@ -212,8 +212,7 @@
 art_debug_cflags := \
   -O2 \
   -DDYNAMIC_ANNOTATIONS_ENABLED=1 \
-  -UNDEBUG \
-  -fkeep-inline-functions
+  -UNDEBUG
 
 art_host_non_debug_cflags := $(art_non_debug_cflags)
 art_target_non_debug_cflags := $(art_non_debug_cflags)