[gn build] Port fa824dc

Author: llvmgnsyncbot

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

@@ -21,6 +21,7 @@ static_library("IR") {
     "BasicBlock.cpp",
     "BuiltinGCs.cpp",
     "Comdat.cpp",
+    "ConstantFPRange.cpp",
     "ConstantFold.cpp",
     "ConstantRange.cpp",
     "ConstantRangeList.cpp",

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

@@ -17,6 +17,7 @@ unittest("IRTests") {
     "BasicBlockDbgInfoTest.cpp",
     "BasicBlockTest.cpp",
     "CFGBuilder.cpp",
+    "ConstantFPRangeTest.cpp",
     "ConstantRangeListTest.cpp",
     "ConstantRangeTest.cpp",
     "ConstantsTest.cpp",