[gn build] Port 883dbb9

Author: llvmgnsyncbot

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

@@ -48,7 +48,6 @@ static_library("IPO") {
     "Internalize.cpp",
     "LoopExtractor.cpp",
     "LowerTypeTests.cpp",
-    "MemProfContextDisambiguation.cpp",
     "MergeFunctions.cpp",
     "ModuleInliner.cpp",
     "OpenMPOpt.cpp",