Update DebugInfo header.ll test after LLVM change (#2946)

Update for LLVM commit 7b23f413d1.

Author: svenvh

test/DebugInfo/X86/header.ll

@@ -16,8 +16,8 @@ target triple = "spir64-unknown-unknown"
 
 ; Test that we don't pollute the start of the file with debug sections
 
-; CHECK:       .text
-; CHECK-NEXT: .file	"<stdin>"
+; CHECK: .file	"<stdin>"
+; CHECK-NEXT: .text
 ; CHECK-NEXT: .globl	f
 ; CHECK-NEXT: .p2align	4
 ; CHECK-NEXT: .type	f,@function