ghc/fix-build-using-unregisteri...

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Description: Allow unregisterised ghc-8.6 to build newer GHC
Commit af9b744bbf1 introduced a regression stopping existing unregisterised
compilers from being able to compile newer versions of GHC. The problem is
that the bootstrap compiler uses the newer `includes/stg/MiscClosures.h` file
where some defines have been renamed, resulting in the following error:
.
error: stg_atomicModifyMutVarzh undeclared (first use in this function); did you mean stg_atomicModifyMutVar2zh?
.
For more information, see https://gitlab.haskell.org/ghc/ghc/issues/17111.
.
This patch can be removed, once ghc-8.6 is no longer the bootstrap compiler.
Author: Ilias Tsitsimpis <iliastsi@debian.org>
Bug: https://gitlab.haskell.org/ghc/ghc/issues/17111
Index: b/includes/stg/MiscClosures.h
===================================================================
--- a/includes/stg/MiscClosures.h
+++ b/includes/stg/MiscClosures.h
@@ -390,8 +390,12 @@ RTS_FUN_DECL(stg_copySmallMutableArrayzh
RTS_FUN_DECL(stg_casSmallArrayzh);
RTS_FUN_DECL(stg_newMutVarzh);
+#if __GLASGOW_HASKELL__ < 808
+RTS_FUN_DECL(stg_atomicModifyMutVarzh);
+#else
RTS_FUN_DECL(stg_atomicModifyMutVar2zh);
RTS_FUN_DECL(stg_atomicModifyMutVarzuzh);
+#endif
RTS_FUN_DECL(stg_casMutVarzh);
RTS_FUN_DECL(stg_isEmptyMVarzh);