i386: Add MAX_OPERAND_BUFFER_SIZE

When displaying operands, invalid opcodes may overflow operand buffer
due to additional styling characters.  Each style is encoded with 3
bytes.  Define MAX_OPERAND_BUFFER_SIZE for operand buffer size and
increase it from 100 bytes to 128 bytes to accommodate 9 sets of styles
in an operand.

gas/

	PR binutils/29483
	* testsuite/gas/i386/i386.exp: Run pr29483.
	* testsuite/gas/i386/pr29483.d: New file.
	* testsuite/gas/i386/pr29483.s: Likewise.

opcodes/

	PR binutils/29483
	* i386-dis.c (MAX_OPERAND_BUFFER_SIZE): New.
	(obuf): Replace 100 with MAX_OPERAND_BUFFER_SIZE.
	(staging_area): Likewise.
	(op_out): Likewise.

gas/testsuite/gas/i386/i386.exp

@@ -1346,6 +1346,7 @@ if [gas_64_check] then {
 	run_dump_test ehinterp
     }
     run_dump_test pr27198
+    run_dump_test pr29483
 
     set ASFLAGS "$old_ASFLAGS --64"
 

gas/testsuite/gas/i386/pr29483.d

@@ -0,0 +1,10 @@
+#objdump: -dw
+
+.*: +file format .*
+
+
+Disassembly of section .text:
+
+0+ <pr29483>:
+ +[a-f0-9]+:	65 62 62 7d 97 a0 94 ff 20 20 20 ae 	vpscatterdd %xmm26,%gs:-0x51dfdfe0\(%rdi,%xmm23,8\)\{bad\}\{%k7\}\{z\}/\(bad\)
+#pass

gas/testsuite/gas/i386/pr29483.s

@@ -0,0 +1,3 @@
+	.text
+pr29483:
+	.byte 0x65,0x62,0x62,0x7d,0x97,0xa0,0x94,0xff,0x20,0x20,0x20,0xae

opcodes/i386-dis.c

@@ -119,6 +119,9 @@ static void DistinctDest_Fixup (instr_info *, int, int);
    buffers.  See oappend_insert_style for more details.  */
 #define STYLE_MARKER_CHAR '\002'
 
+/* The maximum operand buffer size.  */
+#define MAX_OPERAND_BUFFER_SIZE 128
+
 struct dis_private {
   /* Points to first byte not fetched.  */
   bfd_byte *max_fetched;
@@ -165,7 +168,7 @@ struct instr_info
      current instruction.  */
   int evex_used;
 
-  char obuf[100];
+  char obuf[MAX_OPERAND_BUFFER_SIZE];
   char *obufp;
   char *mnemonicendp;
   unsigned char *start_codep;
@@ -9275,7 +9278,7 @@ i386_dis_printf (instr_info *ins, enum disassembler_style style,
   va_list ap;
   enum disassembler_style curr_style = style;
   char *start, *curr;
-  char staging_area[100];
+  char staging_area[MAX_OPERAND_BUFFER_SIZE];
   int res;
 
   va_start (ap, fmt);
@@ -9377,7 +9380,7 @@ print_insn (bfd_vma pc, disassemble_info *info, int intel_syntax)
     .last_seg_prefix = -1,
     .fwait_prefix = -1,
   };
-  char op_out[MAX_OPERANDS][100];
+  char op_out[MAX_OPERANDS][MAX_OPERAND_BUFFER_SIZE];
 
   priv.orig_sizeflag = AFLAG | DFLAG;
   if ((info->mach & bfd_mach_i386_i386) != 0)