Optimized WebRtcIsacfix_NormLatticeFilterMa() function for iSAC fix for ARM Neon

architecture with intrinsics and assembly code. The total iSAC codec speech improved
about 3~5%.

Notes
(1) The Neon version after this optimization is not bit-exact with the generic
C version. The out quality, however, is not worse as verified by test vectors ouput,
and undertandably in theory (32bit x 32bit in Neon is more accurate than the approximation
C code in the generic version).
(2) In Android, a isac neon library will be built. Along with some new function structures,
it is partly for preparation of introducing a run time detection of Neon architecture soon.
Review URL: http://webrtc-codereview.appspot.com/268016

git-svn-id: http://webrtc.googlecode.com/svn/trunk@1192 4adac7df-926f-26a2-2b94-8c16560cd09d

Android.mk

@@ -103,6 +103,7 @@ include $(BUILD_SHARED_LIBRARY)
 LOCAL_PATH := $(call my-dir)
 
 include $(CLEAR_VARS)
+include $(LOCAL_PATH)/../../external/webrtc/android-webrtc.mk
 
 LOCAL_ARM_MODE := arm
 LOCAL_MODULE := libwebrtc
@@ -137,6 +138,15 @@ LOCAL_WHOLE_STATIC_LIBRARIES := \
     libwebrtc_jpeg \
     libwebrtc_vpx
 
+# Add Neon libraries.
+ifneq (,$(filter '-DWEBRTC_DETECT_ARM_NEON',$(MY_WEBRTC_COMMON_DEFS)))
+LOCAL_WHOLE_STATIC_LIBRARIES += \
+    libwebrtc_isacfix_neon
+else ifeq ($(ARCH_ARM_HAVE_NEON),true)
+LOCAL_WHOLE_STATIC_LIBRARIES += \
+    libwebrtc_isacfix_neon
+endif
+
 LOCAL_SHARED_LIBRARIES := \
     libcutils \
     libdl \