add namespace std for sort function in llvmext.cpp

weld-project / weld

High-performance runtime for data analytics applications

https://www.weld.rs

BSD 3-Clause "New" or "Revised" License

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Closed harumichi closed 5 years ago

harumichi commented 5 years ago

because compiling in some environment is failed due to name ambiguous error.

harumichi commented 5 years ago

llvm: 8.0.0