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/usr/src/gcc-5/debian/patches/kfreebsd-boehm-gc.diff is in gcc-5-source 5.5.0-12ubuntu1.

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# DP: boehm-gc: use mmap instead of brk also on kfreebsd-*.

Index: b/src/boehm-gc/configure.host
===================================================================
--- a/src/boehm-gc/configure.host
+++ b/src/boehm-gc/configure.host
@@ -41,7 +41,7 @@ else
 fi
 
 case "${host}" in
-  *-linux*)
+  *-linux*|*-kfreebsd*-gnu*)
     gc_use_mmap=yes
     ;;
 esac