Dispose disassembler after use in unit test.

llvm-svn: 222083
diff --git a/llvm/unittests/MC/Disassembler.cpp b/llvm/unittests/MC/Disassembler.cpp
index e432b15..dd0f1ef 100644
--- a/llvm/unittests/MC/Disassembler.cpp
+++ b/llvm/unittests/MC/Disassembler.cpp
@@ -59,4 +59,6 @@
                                    OutStringSize);
   EXPECT_EQ(InstSize, 2U);
   EXPECT_EQ(StringRef(OutString), "\tjmp\t0x1");
+
+  LLVMDisasmDispose(DCR);
 }