add link to FileCheck docs

rust-lang · Aug 26, 2019 · 633f67a · 633f67a
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commit 633f67a
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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>.