Remove -fstrict-aliasing from arm32.

Our global default is -fno-strict-aliasing (including for 32-bit x86),
so let's avoid a source of arm32-only bugs.

Bug: http://b/31600139
Test: treehugger
Change-Id: Iaf3069200b2969718593387dc5b756c574a5d68a
diff --git a/cc/config/arm_device.go b/cc/config/arm_device.go
index dec2b45..3397e3d 100644
--- a/cc/config/arm_device.go
+++ b/cc/config/arm_device.go
@@ -43,9 +43,7 @@
 
 	armNoFixCortexA8LdFlags = []string{"-Wl,--no-fix-cortex-a8"}
 
-	armArmCflags = []string{
-		"-fstrict-aliasing",
-	}
+	armArmCflags = []string{}
 
 	armThumbCflags = []string{
 		"-mthumb",