[gn build] Port f7b6501

Author: llvmgnsyncbot

llvm/utils/gn/secondary/llvm/lib/Transforms/Instrumentation/BUILD.gn

@@ -28,6 +28,7 @@ static_library("Instrumentation") {
     "NumericalStabilitySanitizer.cpp",
     "PGOCtxProfFlattening.cpp",
     "PGOCtxProfLowering.cpp",
+    "PGOEstimateTripCounts.cpp",
     "PGOForceFunctionAttrs.cpp",
     "PGOInstrumentation.cpp",
     "PGOMemOPSizeOpt.cpp",