[clang] [llvm] [flang] [clang-tools-extra] [flang] GETLOG runtime and extension implementation: get login username (PR #74628)

[Peter Klausler via cfe-commits]

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@@ -657,6 +657,11 @@ CALL CO_REDUCE
 CALL CO_SUM
 ```
 
+### Library subroutine 
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klausler wrote:

Please put this new section later, after all of the non-standard intrinsics, so the actual intrinsic procedures appear together.

https://github.com/llvm/llvm-project/pull/74628