[clang][IFS][test] Fixing buildbot test fails for clang-ifs.

Checking for the exact triple fails on many bots. Leaving the triple
check blank.
diff --git a/clang/test/InterfaceStubs/cxx-conversion.cpp b/clang/test/InterfaceStubs/cxx-conversion.cpp
index e1f7b56..70496ce 100644
--- a/clang/test/InterfaceStubs/cxx-conversion.cpp
+++ b/clang/test/InterfaceStubs/cxx-conversion.cpp
@@ -2,7 +2,7 @@
 
 // CHECK:      --- !experimental-ifs-v1
 // CHECK-NEXT: IfsVersion: 1.0
-// CHECK-NEXT: Triple: x86_64-unknown-linux-gnu
+// CHECK-NEXT: Triple:
 // CHECK-NEXT: ObjectFileFormat: ELF
 // CHECK-NEXT: Symbols:
 // CHECK-NEXT: ...
@@ -10,4 +10,4 @@
 template<typename T> class C1 {
     long a;
     operator long() const { return a; }
-};
\ No newline at end of file
+};