Revert "[gn build] Port 14d3585"

This reverts commit a0c7108.

Author: michalpaszkowski

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

@@ -34,7 +34,6 @@ static_library("Utils") {
     "FunctionImportUtils.cpp",
     "GlobalStatus.cpp",
     "GuardUtils.cpp",
-    "IRCanonicalizer.cpp",
     "ImportedFunctionsInliningStatistics.cpp",
     "InjectTLIMappings.cpp",
     "InlineFunction.cpp",