[libFuzzer] actually make the dictionaries work (+docs)

llvm-svn: 246825
diff --git a/llvm/lib/Fuzzer/test/fuzzer.test b/llvm/lib/Fuzzer/test/fuzzer.test
index 3b8cf09..d5bd9a3 100644
--- a/llvm/lib/Fuzzer/test/fuzzer.test
+++ b/llvm/lib/Fuzzer/test/fuzzer.test
@@ -37,3 +37,6 @@
 
 RUN: not LLVMFuzzer-SwitchTest -use_traces=1 -seed=1 -runs=1000000  2>&1 | FileCheck %s
 RUN:     LLVMFuzzer-SwitchTest               -seed=1 -runs=1000000  2>&1 | FileCheck %s --check-prefix=Done1000000
+
+RUN: not LLVMFuzzer-SimpleDictionaryTest -dict=%S/dict1.txt -seed=1 -runs=1000000  2>&1 | FileCheck %s
+RUN:     LLVMFuzzer-SimpleDictionaryTest                    -seed=1 -runs=1000000  2>&1 | FileCheck %s --check-prefix=Done1000000