gn build: Merge r372264

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@372265 91177308-0d34-0410-b5e6-96231b3b80d8

utils/gn/secondary/llvm/tools/llvm-reduce/BUILD.gn

@@ -12,6 +12,7 @@ executable("llvm-reduce") {
     "TestRunner.cpp",
     "deltas/Delta.cpp",
     "deltas/ReduceArguments.cpp",
+    "deltas/ReduceBasicBlocks.cpp",
     "deltas/ReduceFunctions.cpp",
     "deltas/ReduceGlobalVars.cpp",
     "deltas/ReduceMetadata.cpp",