[Clang] Try to fix test on Windows (NFC)

Try to fix failure reported in
https://reviews.llvm.org/rG9466b49171dc#1154213 by making the
match more specific, as there are multiple dbg.declares that
could be matched.

Author: nikic

clang/test/CodeGenObjC/2010-02-09-DbgSelf.m

@@ -1,6 +1,6 @@
 // RUN: %clang_cc1 -x objective-c -emit-llvm -debug-info-kind=limited < %s | FileCheck %s
 // Test to check that "self" argument is assigned a location.
-// CHECK: call void @llvm.dbg.declare(metadata ptr %{{[^,]+}}, metadata [[SELF:![0-9]*]], metadata !{{.*}})
+// CHECK: call void @llvm.dbg.declare(metadata ptr %self.addr, metadata [[SELF:![0-9]*]], metadata !{{.*}})
 // CHECK: [[SELF]] = !DILocalVariable(name: "self", arg: 1,
 
 @interface Foo