[gn build] Port d8b61d7

Author: llvmgnsyncbot

llvm/utils/gn/secondary/llvm/tools/llvm-exegesis/lib/BUILD.gn

@@ -36,6 +36,7 @@ static_library("lib") {
     "PerfHelper.cpp",
     "RegisterAliasing.cpp",
     "RegisterValue.cpp",
+    "ResultAggregator.cpp",
     "SchedClassResolution.cpp",
     "SerialSnippetGenerator.cpp",
     "SnippetFile.cpp",

llvm/utils/gn/secondary/llvm/unittests/tools/llvm-exegesis/BUILD.gn

@@ -16,5 +16,6 @@ unittest("LLVMExegesisTests") {
     "ClusteringTest.cpp",
     "ProgressMeterTest.cpp",
     "RegisterValueTest.cpp",
+    "ResultAggregatorTest.cpp",
   ]
 }