[PATCH] x86: remove indirection from bx[] and di_si[]

[Jan Beulich <jbeulich@suse.com>]

The longest register name is 3 characters (plus a nul one), so using a
4- or 8-byte pointer to get at it is neither space nor time efficient.
Embed the names right into the array. For PIE this also slightly reduces
the number of base relocations in the final image.
---
di_si[], looking at its contents, also is somewhat misnamed, I would
say.

--- a/gas/config/tc-i386.c
+++ b/gas/config/tc-i386.c
@@ -12250,13 +12250,13 @@ i386_index_check (const char *operand_st
       /* Memory operands of string insns are special in that they only allow
 	 a single register (rDI, rSI, or rBX) as their memory address.  */
       const reg_entry *expected_reg;
-      static const char *di_si[][2] =
+      static const char di_si[][2][4] =
 	{
 	  { "esi", "edi" },
 	  { "si", "di" },
 	  { "rsi", "rdi" }
 	};
-      static const char *bx[] = { "ebx", "bx", "rbx" };
+      static const char bx[][4] = { "ebx", "bx", "rbx" };
 
       kind = "string address";