[ARC] Fixes TLS failures related to tls-align.

This patch fixes glibc testcase in nptl/tls-align.

bfd/
2018-08-01  Cupertino Miranda <cmiranda@synopsys.com>

	* arc-got.h (relocate_fix_got_relocs_for_got_info): Changed, fixed
	    TCB_SIZE offsize to include section alignment.
	* elf32-arc.c (arc_special_overflow_checks): Likewise.

include/
2018-08-01  Cupertino Miranda <cmiranda@synopsys.com>

	* arc-reloc.def (ARC_TLS_LE_32): Updated reloc formula.

bfd/arc-got.h

@@ -24,6 +24,9 @@
 
 #define TCB_SIZE (8)
 
+#define	align_power(addr, align)	\
+  (((addr) + ((bfd_vma) 1 << (align)) - 1) & (-((bfd_vma) 1 << (align))))
+
 enum tls_type_e
 {
   GOT_UNKNOWN = 0,
@@ -359,7 +362,10 @@ relocate_fix_got_relocs_for_got_info (struct got_entry **	   list_p,
 
 		bfd_put_32 (output_bfd,
 			    sym_value - sec_vma
-			    + (elf_hash_table (info)->dynamic_sections_created ? 0 : TCB_SIZE),
+			    + (elf_hash_table (info)->dynamic_sections_created
+			       ? 0
+			       : (align_power (TCB_SIZE,
+					       tls_sec->alignment_power))),
 			    htab->sgot->contents + entry->offset
 			    + (entry->existing_entries == TLS_GOT_MOD_AND_OFF
 			       ? 4 : 0));

bfd/elf32-arc.c

@@ -1218,7 +1218,8 @@ arc_special_overflow_checks (const struct arc_relocation_data reloc_data,
 #define _SDA_BASE_ (bfd_signed_vma) (reloc_data.sdata_begin_symbol_vma)
 #define TLS_REL (bfd_signed_vma) \
   ((elf_hash_table (info))->tls_sec->output_section->vma)
-#define TLS_TBSS (8)
+#define TLS_TBSS (align_power(TCB_SIZE, \
+		  reloc_data.sym_section->alignment_power))
 
 #define none (0)
 

include/elf/arc-reloc.def

@@ -489,7 +489,7 @@ ARC_RELOC_HOWTO(ARC_TLS_LE_32, 75, \
                 32, \
                 replace_word32, \
                 dont, \
-                ( ME ( ( ( ( S + A ) + TCB_SIZE ) - TLS_REL ) ) ))
+		( ME ( ( ( ( S + A ) + TLS_TBSS ) - TLS_REL ) ) ))
 
 ARC_RELOC_HOWTO(ARC_S25W_PCREL_PLT, 76, \
                 2, \