[llvm] [cuda] Improve LLVM 8 compatibility

[yuanming-hu]

Related issue = #1204

@archibate could you test if this solves your problem? Thanks!

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[archibate]

Did solve my problem! So what's the ultimate solution?

[yuanming-hu]

Did solve my problem! So what's the ultimate solution?

Let's see if the problem persists after we upgrade to LLVM 10. If it's gone with LLVM 10, we don't need to do anything :-)

Sorry, but I'd revert your commit since we don't want the users to get error messages.

[codecov]

Codecov Report

Merging #1210 into master will decrease coverage by 1.11%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1210      +/-   ##
==========================================
- Coverage   67.10%   65.98%   -1.12%     
==========================================
  Files          35       35              
  Lines        4831     4669     -162     
  Branches      885      885              
==========================================
- Hits         3242     3081     -161     
+ Misses       1414     1413       -1     
  Partials      175      175              

Impacted Files	Coverage Δ
python/taichi/misc/task.py	75.00% <0.00%> (-5.00%)	⬇️
python/taichi/lang/ops.py	92.09% <0.00%> (-1.57%)	⬇️
python/taichi/lang/matrix.py	83.42% <0.00%> (-1.38%)	⬇️
python/taichi/main.py	42.46% <0.00%> (-1.07%)	⬇️
python/taichi/lang/util.py	50.93% <0.00%> (-0.90%)	⬇️
python/taichi/misc/gui.py	23.72% <0.00%> (-0.71%)	⬇️
python/taichi/lang/ast_checker.py	87.87% <0.00%> (-0.70%)	⬇️
python/taichi/lang/linalg.py	89.33% <0.00%> (-0.67%)	⬇️
python/taichi/lang/expr.py	87.42% <0.00%> (-0.65%)	⬇️
python/taichi/lang/meta.py	61.90% <0.00%> (-0.60%)	⬇️
... and 4 more

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