Rollup merge of rust-lang#63921 - RalfJung:file-check, r=alexcrichton

add link to FileCheck docs Thanks @gnzlbg for pointing me to those docs.
Centril · Aug 26, 2019 · 9c5c124 · 9c5c124
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diff --git a/src/test/codegen/README.md b/src/test/codegen/README.md
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+The files here use the LLVM FileCheck framework, documented at
+<https://llvm.org/docs/CommandGuide/FileCheck.html>.