Avoid assembler warnings from AArch64 constructor/destructor priorities.

Many GCC tests fail for AArch64 with current binutils because of
assembler warnings of the form "Warning: ignoring incorrect section
type for .init_array.00100".  The same issue was fixed for ARM in
r247015 by using SECTION_NOTYPE when creating those sections; this
patch applies the same fix to AArch64.

Tested with no regressions with cross to aarch64-linux-gnu.

	* config/aarch64/aarch64.c (aarch64_elf_asm_constructor)
	(aarch64_elf_asm_destructor): Pass SECTION_NOTYPE to get_section
	when creating .init_array and .fini_array sections with priority
	specified.

From-SVN: r253252

gcc/ChangeLog

+2017-09-28  Joseph Myers  <joseph@codesourcery.com>
+
+	* config/aarch64/aarch64.c (aarch64_elf_asm_constructor)
+	(aarch64_elf_asm_destructor): Pass SECTION_NOTYPE to get_section
+	when creating .init_array and .fini_array sections with priority
+	specified.
+
 2017-09-27  Christophe Lyon  <christophe.lyon@linaro.org>
 
 	PR target/71727

gcc/config/aarch64/aarch64.c

@@ -6095,7 +6095,7 @@ aarch64_elf_asm_constructor (rtx symbol, int priority)
          -Wformat-truncation false positive, use a larger size.  */
       char buf[23];
       snprintf (buf, sizeof (buf), ".init_array.%.5u", priority);
-      s = get_section (buf, SECTION_WRITE, NULL);
+      s = get_section (buf, SECTION_WRITE | SECTION_NOTYPE, NULL);
       switch_to_section (s);
       assemble_align (POINTER_SIZE);
       assemble_aligned_integer (POINTER_BYTES, symbol);
@@ -6115,7 +6115,7 @@ aarch64_elf_asm_destructor (rtx symbol, int priority)
          -Wformat-truncation false positive, use a larger size.  */
       char buf[23];
       snprintf (buf, sizeof (buf), ".fini_array.%.5u", priority);
-      s = get_section (buf, SECTION_WRITE, NULL);
+      s = get_section (buf, SECTION_WRITE | SECTION_NOTYPE, NULL);
       switch_to_section (s);
       assemble_align (POINTER_SIZE);
       assemble_aligned_integer (POINTER_BYTES, symbol);