assembly: rework HIDDEN_DIRECTIVE to accomodate COFF

Rename the HIDDEN_DIRECTIVE macro to HIDDEN and give it a parameter providing
the name of the symbol to be given hidden visibility.  This makes the macros
more amenable to COFF.

llvm-svn: 209094

compiler-rt/lib/builtins/assembly.h

@@ -23,13 +23,13 @@
 #endif
 
 #if defined(__APPLE__)
-#define HIDDEN_DIRECTIVE .private_extern
+#define HIDDEN(name) .private_extern name
 #define LOCAL_LABEL(name) L_##name
 // tell linker it can break up file at label boundaries
 #define FILE_LEVEL_DIRECTIVE .subsections_via_symbols
 #define SYMBOL_IS_FUNC(name)
 #else
-#define HIDDEN_DIRECTIVE .hidden
+#define HIDDEN(name) .hidden name
 #define LOCAL_LABEL(name) .L_##name
 #define FILE_LEVEL_DIRECTIVE
 #if defined(__arm__)
@@ -90,7 +90,7 @@
 
 #ifdef VISIBILITY_HIDDEN
 #define DECLARE_SYMBOL_VISIBILITY(name)                                        \
-  HIDDEN_DIRECTIVE SYMBOL_NAME(name) SEPARATOR
+  HIDDEN(SYMBOL_NAME(name)) SEPARATOR
 #else
 #define DECLARE_SYMBOL_VISIBILITY(name)
 #endif
@@ -106,13 +106,13 @@
   FILE_LEVEL_DIRECTIVE SEPARATOR                                               \
   .globl SYMBOL_NAME(name) SEPARATOR                                           \
   SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR                                  \
-  HIDDEN_DIRECTIVE SYMBOL_NAME(name) SEPARATOR                                 \
+  HIDDEN(SYMBOL_NAME(name)) SEPARATOR                                          \
   SYMBOL_NAME(name):
 
 #define DEFINE_COMPILERRT_PRIVATE_FUNCTION_UNMANGLED(name)                     \
   .globl name SEPARATOR                                                        \
   SYMBOL_IS_FUNC(name) SEPARATOR                                               \
-  HIDDEN_DIRECTIVE name SEPARATOR                                              \
+  HIDDEN(name) SEPARATOR                                                       \
   name:
 
 #define DEFINE_COMPILERRT_FUNCTION_ALIAS(name, target)                         \