Ensure that padding in the constant pool uses constant values.

	PR target/20068
	* config/tc-arm.c (add_to_lit_pool): Ensure that the padding added
	to the pool uses O_constant.
	* testsuite/gas/arm/pr20068.s: New test.
	* testsuite/gas/arm/pr20068.d: Test driver.

gas/ChangeLog

+2016-05-11  Nick Clifton  <nickc@redhat.com>
+
+	PR target/20068
+	* config/tc-arm.c (add_to_lit_pool): Ensure that the padding added
+	to the pool uses O_constant.
+	* testsuite/gas/arm/pr20068.s: New test.
+	* testsuite/gas/arm/pr20068.d: Test driver.
+
 2016-05-11  Nick Clifton  <nickc@redhat.com>
 
 	* testsuite/gas/arm/archv8m-cmse-base.d: Skip for non-ELF ARM targets.

gas/config/tc-arm.c

@@ -3288,6 +3288,7 @@ add_to_lit_pool (unsigned int nbytes)
 		}
 	      pool->literals[entry] = inst.reloc.exp;
+	      pool->literals[entry].X_op = O_constant;
 	      pool->literals[entry].X_add_number = 0;
 	      pool->literals[entry++].X_md = (PADDING_SLOT << 8) | 4;
 	      pool->next_free_entry += 1;

gas/testsuite/gas/arm/pr20068.d

+# name: PR20068 - Misaligned constant pool when running GAS on a 32-bit host.
+# as: -mfpu=vfpv3
+# objdump: -S
+
+.*:     file format .*
+
+
+Disassembly of section .text:
+
+00000000 <main>:
+   0:	e59f0008 	ldr	r0, \[pc, #8\].*
+   4:	ed9f9b03 	vldr	d9, \[pc, #12\].*
+   8:	e1a0f00e 	mov	pc, lr
+   c:	00000000 	.*
+  10:	12345678 	.*
+  14:	00000000 	.*
+  18:	00000fff 	.*
+  1c:	0000fff0 	.*

gas/testsuite/gas/arm/pr20068.s

+.global main
+
+main:
+LDR R0, =0x12345678
+@LDR R0, =0x87654321
+FLDD D9, =0xfff000000fff
+@FLDD D9, =0
+@FLDD D9, =0x0
+MOV PC, LR
+.ltorg