[PATCH] x86: add Bk and Br to comment list B's sub-chars

[Jan Beulich via Gcc-patches]

gcc/

        * config/i386/constraints.md: Mention k and r for B.

--- a/gcc/config/i386/constraints.md
+++ b/gcc/config/i386/constraints.md
@@ -162,7 +162,9 @@
 ;;  g  GOT memory operand.
 ;;  m  Vector memory operand
 ;;  c  Constant memory operand
+;;  k  TLS address that allows insn using non-integer registers
 ;;  n  Memory operand without REX prefix
+;;  r  Broadcast memory operand
 ;;  s  Sibcall memory operand, not valid for TARGET_X32
 ;;  w  Call memory operand, not valid for TARGET_X32
 ;;  z  Constant call address operand.