Followup on Proposal to move MIR physical register namespace to '$' sigil.

Discussed here:

http://lists.llvm.org/pipermail/llvm-dev/2018-January/120320.html

In preparation for adding support for named vregs we are changing the sigil for
physical registers in MIR to '$' from '%'. This will prevent name clashes of
named physical register with named vregs.

llvm-svn: 323922
diff --git a/llvm/test/CodeGen/X86/atomic-eflags-reuse.ll b/llvm/test/CodeGen/X86/atomic-eflags-reuse.ll
index fc2b567..b8b2b7f 100644
--- a/llvm/test/CodeGen/X86/atomic-eflags-reuse.ll
+++ b/llvm/test/CodeGen/X86/atomic-eflags-reuse.ll
@@ -93,7 +93,7 @@
 ; CHECK-NEXT:    movl $1, %eax
 ; CHECK-NEXT:    lock xaddq %rax, (%rdi)
 ; CHECK-NEXT:    shrq $63, %rax
-; CHECK-NEXT:    # kill: def %al killed %al killed %rax
+; CHECK-NEXT:    # kill: def $al killed $al killed $rax
 ; CHECK-NEXT:    retq
 entry:
   %tmp0 = atomicrmw add i64* %p, i64 1 seq_cst