Added patch for scav bco

NixSupport/mkGhcCompiler.nix

@@ -40,7 +40,7 @@ let
   ihpDontHaddockPackages = [];
 in ghcCompiler.override {
   ghc = if pkgs.stdenv.isDarwin
-    then ghcCompiler.ghc.overrideAttrs (oldAttrs: { patches = [ ./ghc-12264.patch ] ++ (oldAttrs.patches or []); })
+    then ghcCompiler.ghc.overrideAttrs (oldAttrs: { patches = [ ./ghc-12264.patch ./scav-bco.patch ] ++ (oldAttrs.patches or []); })
     else ghcCompiler.ghc;
   overrides = composeExtensionsList [
     generatedOverrides

NixSupport/scav-bco.patch

@@ -0,0 +1,27 @@
+commit 1ed6e300d57a48129786ba2dfbda6da1e233a454 (HEAD -> wip/T23415-9.8)
+Author: Ian-Woo Kim <[email protected]>
+Date:   Mon May 22 12:22:33 2023 -0700
+
+    Add missing BCO handling in scavenge_one.
+
+    (cherry picked from commit 902ebcc2b95707319d37a19d6b23c342cc14b162)
+
+diff --git a/rts/sm/Scav.c b/rts/sm/Scav.c
+index 8debec6a666..9bbe069d875 100644
+--- a/rts/sm/Scav.c
++++ b/rts/sm/Scav.c
+@@ -1593,6 +1593,14 @@ scavenge_one(StgPtr p)
+ #endif
+       break;
+
++    case BCO: {
++        StgBCO *bco = (StgBCO *)p;
++        evacuate((StgClosure **)&bco->instrs);
++        evacuate((StgClosure **)&bco->literals);
++        evacuate((StgClosure **)&bco->ptrs);
++        break;
++    }
++
+     case COMPACT_NFDATA:
+         scavenge_compact((StgCompactNFData*)p);
+         break;