Enable building with clang/llvm.

The llvm bug https://llvm.org/bugs/show_bug.cgi?id=21572 was fixed.

BUG: 18373866
Change-Id: Ia529bf53267f636880515ccefb4ca1cf7d731baf
(cherry picked from commit 7630881d853b130e2c1f11cb2dafebe684bcfa91)
diff --git a/services/audioflinger/Android.mk b/services/audioflinger/Android.mk
index c359be5..debcdf9 100644
--- a/services/audioflinger/Android.mk
+++ b/services/audioflinger/Android.mk
@@ -29,12 +29,6 @@
 
 include $(CLEAR_VARS)
 
-# Clang++ aborts on AudioMixer.cpp,
-# b/18373866, "do not know how to split this operator."
-ifeq ($(filter $(TARGET_ARCH),arm arm64),$(TARGET_ARCH))
-    LOCAL_CLANG := false
-endif
-
 LOCAL_SRC_FILES:=               \
     AudioFlinger.cpp            \
     Threads.cpp                 \