Update multiline.ll testcase to handle (ppc64le) .localentry directive

[willschm]

Summary

The ppc64le platform will emit a .localentry directive. this is triggering a false-positive against a CHECK-NOT: .loc in multiline.ll as seen at
http://lab.llvm.org:8011/builders/ppc64le-clang/builds/1

<...>
<stdin>:31:2: error: CHECK-NOT: string occurred!
.localentry f2, .Ltmp1-.Ltmp0

/home/buildbots/ppc64le-clang/clang-ppc64le-1/llvm.src/test/DebugInfo/multiline.ll:17:14: note: CHECK-NOT: pattern specified here
; CHECK-NOT: .loc

I didn't see a clear way to call out ".localentry is OK" via check-not, so the change here is to add a simple "\n" to the check-not line.

[dblaikie]

I think {{$}} is a more idiomatic way to check for end of line (or at least
it is in that file) - I'm surprised \n works there, actually... but good to
know I guess.

Otherwise looks fine, please commit.

[dblaikie]

Actually, wait - the point of that NOT .loc is to check for any .loc
directive, which has arguments and stuff, so .loc{{$}} is too restrictive
and wouldn't catch other .locs

maybe CHECK-NOT: .loc{{ }}

to force the space? Does that work?

[willschm]

In D6935#107693, @dblaikie wrote:

Actually, wait - the point of that NOT .loc is to check for any .loc
directive, which has arguments and stuff, so .loc{{$}} is too restrictive
and wouldn't catch other .locs

maybe CHECK-NOT: .loc{{ }}

to force the space? Does that work?

I'll investigate further. :-)

Is there a change I can make locally to force that check-not to fail, to ensure I don't silently break things?

[willschm]

Using a space "{{ }}" as suggested does appear to work. (Local tests against powerpc64* and x86 both pass with this change).

[dblaikie]

Great - thanks!

test/DebugInfo/multiline.ll

 ; RUN: llc -filetype=asm -asm-verbose=0 -O0 < %s | FileCheck %s
 ; RUN: llc -filetype=obj -O0 < %s | llvm-dwarfdump -debug-dump=line - | FileCheck %s --check-prefix=INT
 ; XFAIL: hexagon
 
 ; Check that the assembly output properly handles is_stmt changes. And since
 ; we're testing anyway, check the integrated assembler too.
 
 ; Generated with clang from multiline.c:
 ; void f1();
 ; void f2() {
 ;   f1(); f1(); f1();
 ;   f1(); f1(); f1();
 ; }
 
 
 ; CHECK: .loc 1 2 0{{$}}
-; CHECK-NOT: .loc
+; CHECK-NOT: .loc{{ }}
 ; CHECK: .loc 1 3 3 prologue_end{{$}}
 ; CHECK-NOT: .loc
 ; CHECK: .loc 1 3 9 is_stmt 0{{$}}
 ; CHECK-NOT: .loc
 ; CHECK: .loc 1 3 15{{$}}
 ; CHECK-NOT: .loc
 ; CHECK: .loc 1 4 3 is_stmt 1{{$}}
 ; CHECK-NOT: .loc