UnitTests: Replace some if(x)report_fatal_error() with EXPECT_TRUE(!x)

llvm-svn: 305519
diff --git a/llvm/unittests/MI/LiveIntervalTest.cpp b/llvm/unittests/MI/LiveIntervalTest.cpp
index 7118a43..43dfa4a 100644
--- a/llvm/unittests/MI/LiveIntervalTest.cpp
+++ b/llvm/unittests/MI/LiveIntervalTest.cpp
@@ -151,8 +151,7 @@
   std::unique_ptr<MIRParser> MIR;
   std::unique_ptr<Module> M = parseMIR(Context, PM, MIR, *TM, MIRString,
                                        "func");
-  if (!M)
-    report_fatal_error("Could not parse MIR code\n");
+  EXPECT_TRUE(M);
 
   PM.add(new TestPass(T));