More ARM EABI object attributes in binutils. This adds support to binutils

to include the Unaligned Access and Floating-point Half-precision
attributes. the former marks ELF objects that may access ARMv6 style
unaligned data, the latter that the binary uses the VFPv3/Advanced SIMD
half-precision extension.

These may be emmitted by clang so it's best to print a warning when the
linker hits one of them.

Differential Revision:	http://reviews.freebsd.org/D2194
Submitted by:	Michal Meloun <meloun@miracle.cz>
MFC after:	1 week

contrib/binutils/bfd/elf-bfd.h

@@ -1286,7 +1286,7 @@ struct elf_find_verdep_info
 };
 
 /* The maximum number of known object attributes for any target.  */
-#define NUM_KNOWN_OBJ_ATTRIBUTES 32
+#define NUM_KNOWN_OBJ_ATTRIBUTES 71
 
 /* The value of an object attribute.  type & 1 indicates whether there
    is an integer value; type & 2 indicates whether there is a string

contrib/binutils/bfd/elf32-arm.c

@@ -6835,6 +6835,8 @@ elf32_arm_merge_eabi_attributes (bfd *ibfd, bfd *obfd)
 	case Tag_ABI_FP_number_model:
 	case Tag_ABI_align8_preserved:
 	case Tag_ABI_HardFP_use:
+	case Tag_CPU_unaligned_access:
+	case Tag_FP_HP_extension:
 	  /* Use the largest value specified.  */
 	  if (in_attr[i].i > out_attr[i].i)
 	    out_attr[i].i = in_attr[i].i;
@@ -6951,7 +6953,9 @@ elf32_arm_merge_eabi_attributes (bfd *ibfd, bfd *obfd)
 	    }
 	  break;
 	default: /* All known attributes should be explicitly covered.   */
-	  abort ();
+	  /* XXX Not now */
+	  /* abort (); */
+	  break;
 	}
     }
 

contrib/binutils/include/elf/arm.h

@@ -271,7 +271,11 @@ enum
   Tag_ABI_optimization_goals,
   Tag_ABI_FP_optimization_goals,
   /* 32 is generic.  */
-
+  Tag_CPU_unaligned_access = 34,
+  Tag_FP_HP_extension = 36,
+  Tag_ABI_FP_16bit_format = 38,
+  Tag_MPextension_use = 42,
+  Tag_DIV_use = 44,
   Tag_Virtualization_use = 68,
 };