Incorrect llvm version on Unity Editor 2017.4.2f2 for Linux

Unity Engine
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1

I built webgl using 2017.4.2f2 and got an error

llc: Unknown command line argument '-enable-emscripten-cxx-exceptions'. Try: '/opt/Unity/Editor/Data/PlaybackEngines/WebGLSupport/BuildTools/Emscripten_FastComp_Linux/llc -help'
llc: Did you mean '-enable-emscripten-cpp-exceptions'?

So I check llc version and found that it is version 5.0.0 (the version in 2017.4.0f1 is 3.9.0). the new version not accept ‘-enable-emscripten-cxx-exceptions’.

$ /opt/Unity/Editor/Data/PlaybackEngines/WebGLSupport/BuildTools/Emscripten_FastComp_Linux/llc -version
LLVM (http://llvm.org/):
LLVM version 5.0.0
Optimized build.
Default target: x86_64-unknown-linux-gnu
Host CPU: haswell

Registered Targets:
js - JavaScript (asm.js, emscripten) backend
x86 - 32-bit X86: Pentium-Pro and above
x86-64 - 64-bit X86: EM64T and AMD64
2

replace emscripten-cxx-exceptions with emscripten-cpp-exceptions in Editor/Data/PlaybackEngines/WebGLSupport/BuildTools/Emscripten/emscripten.py and build successfully.