[gn build] Port 0e80f9a

Author: llvmgnsyncbot

llvm/utils/gn/secondary/llvm/lib/CodeGen/BUILD.gn

@@ -50,6 +50,7 @@ static_library("CodeGen") {
     "DFAPacketizer.cpp",
     "DeadMachineInstructionElim.cpp",
     "DetectDeadLanes.cpp",
+    "DroppedVariableStats.cpp",
     "DwarfEHPrepare.cpp",
     "EHContGuardCatchret.cpp",
     "EarlyIfConversion.cpp",

llvm/utils/gn/secondary/llvm/unittests/IR/BUILD.gn

@@ -28,7 +28,7 @@ unittest("IRTests") {
     "DemandedBitsTest.cpp",
     "DominatorTreeBatchUpdatesTest.cpp",
     "DominatorTreeTest.cpp",
-    "DroppedVariableStatsTest.cpp",
+    "DroppedVariableStatsIRTest.cpp",
     "FunctionTest.cpp",
     "IRBuilderTest.cpp",
     "InstructionsTest.cpp",