Convert lit tests to check disassembled assembly.

tests_lit/lit.cfg

Index: tests_lit/lit.cfg
diff --git a/tests_lit/lit.cfg b/tests_lit/lit.cfg
index 131e5005c775aa2b4fb672095a165a988c1d1928..643bc86bbc6988c91a14cd4b726d8d2f582ebc4a 100644
--- a/tests_lit/lit.cfg
+++ b/tests_lit/lit.cfg
@@ -42,7 +42,8 @@ config.substitutions.append(
 config.substitutions.append(('%llvm2ice', llvm2icetool))
 config.substitutions.append(('%szdiff', os.path.join(bin_root, 'szdiff.py')))
 
-llvmbintools = [r"\bFileCheck\b", r"\bllvm-mc\b", r"\bnot\b"]
+llvmbintools = [r"\bFileCheck\b", r"\bllvm-mc\b",
+                r"\bllvm-objdump\b", r"\bnot\b"]
 
 for tool in llvmbintools:
   # The re.sub() line is adapted from one of LLVM's lit.cfg files.