Can't build WebGL because of IL2CPP suddenly crashes on unity2020.2.3f1

Hi I can't build WebGL.


Exception: Unity.IL2CPP.Building.BuilderFailedException: �b�h�줸�ժ��ت��r�X�����A�S���o�� Unicode �r���i�H�����쪺�r���C
ERROR:root:Failed to run llvm optimizations:


Invocation was: Executable: "D:\unity\2020.2.3f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten_Win\python\2.7.5.3_64bit\python.exe"
Arguments: -E "D:\unity\2020.2.3f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\em++" -Wno-unused-value -Wno-invalid-offsetof -nostdinc -fno-strict-overflow -Wno-null-conversion -std=c++11 -O3 -Oz -DIL2CPP_EXCEPTION_DISABLED=1 -DNET_4_0 -DUNITY_AOT -DIL2CPP_MONO_DEBUGGER_DISABLED -DGC_NOT_DLL -DRUNTIME_IL2CPP -DBASELIB_INLINE_NAMESPACE=il2cpp_baselib -DNDEBUG -I"D:\unity\2020.2.3f1\Editor\Data\il2cpp\libil2cpp" -I"D:\unity\2020.2.3f1\Editor\Data\il2cpp\libil2cpp" -I"D:\unity\2020.2.3f1\Editor\Data\il2cpp\external\bdwgc\include" -I"D:\unity\2020.2.3f1\Editor\Data\il2cpp\external\xxHash" -I"D:\unity\2020.2.3f1\Editor\Data\il2cpp\external\baselib\Include" -I"D:\unity\2020.2.3f1\Editor\Data\il2cpp\external\baselib\Platforms\WebGL\Include" -I"D:\unity\2020.2.3f1\Editor\Data\il2cpp\libil2cpp\pch" -I"D:\unity\3D Knight\Library\Il2cppBuildCache\WebGL\il2cppOutput" "D:\unity\3D Knight\Library\Il2cppBuildCache\WebGL\il2cppOutput\Il2CppGenericMethodPointerTable.cpp" -o "D:\unity\3D Knight\Library\il2cpp_cache\0BEACADF9E6BB70E71D5033407EC372D.o"

at Unity.IL2CPP.Building.CppProgramBuilder.BuildAllCppFiles(IEnumerable`1 sourceFilesToCompile, IBuildStatisticsCollector statisticsCollector)
at Unity.IL2CPP.Building.CppProgramBuilder.Build(IBuildStatistics& statistics)
at il2cpp.Compilation.CompilationDriver.Run(RuntimePlatform platform, BuildingOptions buildingOptions, ReadOnlyCollection`1 matchedAssemblyMethodSourceFiles)
at il2cpp.Program.DoRun(String[] args, RuntimePlatform platform, BuildingOptions buildingOptions, Boolean throwExceptions)
UnityEditorInternal.Runner.RunProgram (UnityEditor.Utils.Program p, System.String exe, System.String args, System.String workingDirectory, UnityEditor.Scripting.Compilers.CompilerOutputParserBase parser) (at <a936841cea2147a2a55ea27843fa46ae>:0)
UnityEditorInternal.Runner.RunManagedProgram (System.String exe, System.String args, System.String workingDirectory, UnityEditor.Scripting.Compilers.CompilerOutputParserBase parser, System.Action`1[T] setupStartInfo) (at <a936841cea2147a2a55ea27843fa46ae>:0)
UnityEditorInternal.IL2CPPBuilder.RunIl2CppWithArguments (System.Collections.Generic.List`1[T] arguments, System.Action`1[T] setupStartInfo, System.String generatedCppOutputDirectory) (at <a936841cea2147a2a55ea27843fa46ae>:0)
UnityEditorInternal.IL2CPPBuilder.ConvertPlayerDlltoCpp (UnityEditor.Il2Cpp.Il2CppBuildPipelineData data, System.String outputDirectory, System.Boolean platformSupportsManagedDebugging) (at <a936841cea2147a2a55ea27843fa46ae>:0)
UnityEditorInternal.IL2CPPBuilder.Run () (at <a936841cea2147a2a55ea27843fa46ae>:0)
UnityEditorInternal.IL2CPPUtils.RunIl2Cpp (System.String stagingAreaData, UnityEditorInternal.IIl2CppPlatformProvider platformProvider, System.Action`1[T] modifyOutputBeforeCompile, UnityEditor.RuntimeClassRegistry runtimeClassRegistry) (at <a936841cea2147a2a55ea27843fa46ae>:0)
UnityEditor.WebGL.WebGlBuildPostprocessor.CompileBuild (UnityEditor.Modules.BuildPostProcessArgs args) (at /Users/bokken/buildslave/unity/build/PlatformDependent/WebGL/Extensions/Unity.WebGL.extensions/BuildPostprocessor.cs:365)
UnityEditor.WebGL.WebGlBuildPostprocessor.PostProcess (UnityEditor.Modules.BuildPostProcessArgs args) (at /Users/bokken/buildslave/unity/build/PlatformDependent/WebGL/Extensions/Unity.WebGL.extensions/BuildPostprocessor.cs:910)
UnityEditor.Modules.DefaultBuildPostprocessor.PostProcess (UnityEditor.Modules.BuildPostProcessArgs args, UnityEditor.BuildProperties& outProperties) (at <a936841cea2147a2a55ea27843fa46ae>:0)
UnityEditor.PostprocessBuildPlayer.Postprocess (UnityEditor.BuildTargetGroup targetGroup, UnityEditor.BuildTarget target, System.String installPath, System.String companyName, System.String productName, System.Int32 width, System.Int32 height, UnityEditor.BuildOptions options, UnityEditor.RuntimeClassRegistry usedClassRegistry, UnityEditor.Build.Reporting.BuildReport report) (at <a936841cea2147a2a55ea27843fa46ae>:0)
UnityEngine.GUIUtilityrocessEvent(Int32, IntPtr, Boolean&)