Use the dwarf->llvm mapping to print register names in the cfi
directives.

Fixes PR9826.

llvm-svn: 132317
diff --git a/llvm/test/CodeGen/X86/pr9743.ll b/llvm/test/CodeGen/X86/pr9743.ll
index 8feccd9..6597c23 100644
--- a/llvm/test/CodeGen/X86/pr9743.ll
+++ b/llvm/test/CodeGen/X86/pr9743.ll
@@ -9,9 +9,9 @@
 ; CHECK-NEXT: :
 ; CHECK-NEXT:  .cfi_def_cfa_offset 16
 ; CHECK-NEXT: :
-; CHECK-NEXT:  .cfi_offset 6, -16
+; CHECK-NEXT:  .cfi_offset %rbp, -16
 ; CHECK-NEXT:  movq    %rsp, %rbp
 ; CHECK-NEXT: :
-; CHECK-NEXT:  .cfi_def_cfa_register 6
+; CHECK-NEXT:  .cfi_def_cfa_register %rbp
 ; CHECK-NEXT:  popq    %rbp
 ; CHECK-NEXT:  ret