[RS6000] Simplify sysv4.h TARGET_TOC

We can use the TARGET_* defines here.  There isn't any reason to use
the underlying variable and masks.  Also, TARGET_RELOCATABLE implies
TARGET_MINIMAL_TOC, so there is no need to test TARGET_RELOCATABLE.

	* config/rs6000/sysv4.h (TARGET_TOC): Simplify.

From-SVN: r235875

gcc/ChangeLog

 2016-05-04  Alan Modra  <amodra@gmail.com>
 
+	* config/rs6000/sysv4.h (TARGET_TOC): Simplify.
 	* config/rs6000/rs6000.c (rs6000_elf_output_toc_section_asm_op):
 	Align .toc.
 

gcc/config/rs6000/sysv4.h

@@ -40,10 +40,8 @@
 #undef	ASM_DEFAULT_SPEC
 #define	ASM_DEFAULT_SPEC "-mppc"
 
-#define	TARGET_TOC		((rs6000_isa_flags & OPTION_MASK_64BIT)	\
-				 || ((rs6000_isa_flags			\
-				      & (OPTION_MASK_RELOCATABLE	\
-					 | OPTION_MASK_MINIMAL_TOC))	\
+#define	TARGET_TOC		(TARGET_64BIT				\
+				 || (TARGET_MINIMAL_TOC			\
 				     && flag_pic > 1)			\
 				 || DEFAULT_ABI != ABI_V4)