gas: dw2gencfi: move some tc_* defines to the header file

Move the following three defines to the header file, so the SCFI
machinery can use them:
 - tc_cfi_frame_initial_instructions
 - tc_cfi_startproc
 - tc_cfi_endproc

gas/
        * dw2gencfi.c: Move from ...
	* dw2gencfi.h: ... to here.

gas/dw2gencfi.c

@@ -64,18 +64,6 @@
 #define EH_FRAME_ALIGNMENT (bfd_get_arch_size (stdoutput) == 64 ? 3 : 2)
 #endif
 
-#ifndef tc_cfi_frame_initial_instructions
-#define tc_cfi_frame_initial_instructions() ((void)0)
-#endif
-
-#ifndef tc_cfi_startproc
-# define tc_cfi_startproc() ((void)0)
-#endif
-
-#ifndef tc_cfi_endproc
-# define tc_cfi_endproc(fde) ((void) (fde))
-#endif
-
 #define EH_FRAME_LINKONCE (SUPPORT_FRAME_LINKONCE || compact_eh \
 			   || TARGET_MULTIPLE_EH_FRAME_SECTIONS)
 

gas/dw2gencfi.h

@@ -29,6 +29,18 @@ struct fde_entry;
 
 extern const pseudo_typeS cfi_pseudo_table[];
 
+#ifndef tc_cfi_frame_initial_instructions
+#define tc_cfi_frame_initial_instructions() ((void)0)
+#endif
+
+#ifndef tc_cfi_startproc
+# define tc_cfi_startproc() ((void)0)
+#endif
+
+#ifndef tc_cfi_endproc
+# define tc_cfi_endproc(fde) ((void) (fde))
+#endif
+
 /* cfi_finish() is called at the end of file. It will complain if
    the last CFI wasn't properly closed by .cfi_endproc.  */
 extern void cfi_finish (void);