[RS6000] Align .toc section

Lack of any .toc section alignment causes kexec and kdump failure
when linking without the usual linker script.  This of course is
really a kexec-tools error, but it is also true that .toc ought to
always be word aligned.

	* config/rs6000/rs6000.c (rs6000_elf_output_toc_section_asm_op):
	Align .toc.

From-SVN: r235874

gcc/ChangeLog

-2016-06-04  Matthew Fortune  <matthew.fortune@imgtec.com>
+2016-05-04  Alan Modra  <amodra@gmail.com>
+
+	* config/rs6000/rs6000.c (rs6000_elf_output_toc_section_asm_op):
+	Align .toc.
+
+2016-05-04  Matthew Fortune  <matthew.fortune@imgtec.com>
 
 	* config/mips/mips-cpus.def (p5600): Avoid IMADD by default.
 	Clean up p5600 comments.

gcc/config/rs6000/rs6000.c

@@ -31339,8 +31339,8 @@ rs6000_elf_output_toc_section_asm_op (const void *data ATTRIBUTE_UNUSED)
     {
       if (!toc_initialized)
 	{
-	  toc_initialized = 1;
 	  fprintf (asm_out_file, "%s\n", TOC_SECTION_ASM_OP);
+	  ASM_OUTPUT_ALIGN (asm_out_file, TARGET_64BIT ? 3 : 2);
 	  (*targetm.asm_out.internal_label) (asm_out_file, "LCTOC", 0);
 	  fprintf (asm_out_file, "\t.tc ");
 	  ASM_OUTPUT_INTERNAL_LABEL_PREFIX (asm_out_file, "LCTOC1[TC],");
@@ -31348,20 +31348,30 @@ rs6000_elf_output_toc_section_asm_op (const void *data ATTRIBUTE_UNUSED)
 	  fprintf (asm_out_file, "\n");
 
 	  fprintf (asm_out_file, "%s\n", MINIMAL_TOC_SECTION_ASM_OP);
+	  ASM_OUTPUT_ALIGN (asm_out_file, TARGET_64BIT ? 3 : 2);
 	  ASM_OUTPUT_INTERNAL_LABEL_PREFIX (asm_out_file, "LCTOC1");
 	  fprintf (asm_out_file, " = .+32768\n");
+	  toc_initialized = 1;
 	}
       else
 	fprintf (asm_out_file, "%s\n", MINIMAL_TOC_SECTION_ASM_OP);
     }
   else if ((DEFAULT_ABI == ABI_AIX || DEFAULT_ABI == ABI_ELFv2)
 	   && !TARGET_RELOCATABLE)
-    fprintf (asm_out_file, "%s\n", TOC_SECTION_ASM_OP);
+    {
+      fprintf (asm_out_file, "%s\n", TOC_SECTION_ASM_OP);
+      if (!toc_initialized)
+	{
+	  ASM_OUTPUT_ALIGN (asm_out_file, TARGET_64BIT ? 3 : 2);
+	  toc_initialized = 1;
+	}
+    }
   else
     {
       fprintf (asm_out_file, "%s\n", MINIMAL_TOC_SECTION_ASM_OP);
       if (!toc_initialized)
 	{
+	  ASM_OUTPUT_ALIGN (asm_out_file, TARGET_64BIT ? 3 : 2);
 	  ASM_OUTPUT_INTERNAL_LABEL_PREFIX (asm_out_file, "LCTOC1");
 	  fprintf (asm_out_file, " = .+32768\n");
 	  toc_initialized = 1;