Pull in r285478 from upstream compiler-rt trunk (by Saleem Abdulrasool):

build: give aliases the same visibility

  ARM EABI also uses function aliases.  Ensure that those aliased
  functions are given proper visibility annotations.

Reported by:	mmel
MFC after:	3 days
Differential Revision:	https://reviews.freebsd.org/D9633

contrib/compiler-rt/lib/builtins/assembly.h

@@ -149,6 +149,7 @@
 #define DEFINE_COMPILERRT_FUNCTION_ALIAS(name, target)                         \
   .globl SYMBOL_NAME(name) SEPARATOR                                           \
   SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR                                  \
+  DECLARE_SYMBOL_VISIBILITY(SYMBOL_NAME(name)) SEPARATOR                       \
   .set SYMBOL_NAME(name), SYMBOL_NAME(target) SEPARATOR
 
 #if defined(__ARM_EABI__)