llvm-isel-fuzzer: Add some basic tests

llvm-svn: 312427
diff --git a/llvm/test/tools/llvm-isel-fuzzer/missing-triple.ll b/llvm/test/tools/llvm-isel-fuzzer/missing-triple.ll
new file mode 100644
index 0000000..558d77f
--- /dev/null
+++ b/llvm/test/tools/llvm-isel-fuzzer/missing-triple.ll
@@ -0,0 +1,4 @@
+; RUN: opt -o %t %s
+; RUN: not llvm-isel-fuzzer %t 2>&1 | FileCheck %s
+
+; CHECK: -mtriple must be specified