John Ericson 59ae182bc2 Remove unnecessary StringRef convesion in llvm-config
We have a string litteral (via CPP) used to construct `StringRef`, which
is used to construct a `SmallString`. Just construct the latter
directly.

Differential Revision: https://reviews.llvm.org/D111322
2021-10-08 21:16:32 -04:00
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