[analyzer] This test is breaking windows bots, make it darwin-specific.

(The plist output does not match the one we expect, specifically we do
not detect that the interesting symbol is returned by a call.)

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@152969 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Analysis/malloc-plist.c b/test/Analysis/malloc-plist.c
index 326161b..d347e5f 100644
--- a/test/Analysis/malloc-plist.c
+++ b/test/Analysis/malloc-plist.c
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -analyze -analyzer-checker=unix.Malloc -analyzer-output=plist -o %t %s
+// RUN: %clang_cc1 -triple x86_64-apple-darwin -analyze -analyzer-checker=unix.Malloc -analyzer-output=plist -o %t %s
 // RUN: FileCheck --input-file %t %s
 
 typedef __typeof(sizeof(int)) size_t;