Add -Wno-inline-asm to Clang flags.

The latest clang (r230699) does not allow SP/PC to be declared in inline asm
lists. This is a problem for libraries that are attempting to save all
register state.

Change-Id: I1ce80530f8be85fd74e949d0c65b60080e0aaf2a

libbacktrace/Android.build.mk

@@ -29,6 +29,9 @@ LOCAL_CFLAGS := \
     $($(module)_cflags) \
     $($(module)_cflags_$(build_type)) \
 
+LOCAL_CLANG_CFLAGS += \
+    $(libbacktrace_common_clang_cflags) \
+
 LOCAL_CONLYFLAGS += \
     $(common_conlyflags) \
     $($(module)_conlyflags) \

libbacktrace/Android.mk

@@ -26,6 +26,10 @@ common_conlyflags := \
 common_cppflags := \
 	-std=gnu++11 \
 
+# The latest clang (r230699) does not allow SP/PC to be declared in inline asm lists.
+libbacktrace_common_clang_cflags += \
+    -Wno-inline-asm
+
 build_host := false
 ifeq ($(HOST_OS),linux)
 ifeq ($(HOST_ARCH),$(filter $(HOST_ARCH),x86 x86_64))