[test] Use guard malloc in 4c84d3d852cdd1d4.swift

This should hopefully make it crash reliably.

Author: hamishknight

validation-test/compiler_crashers_2/4c84d3d852cdd1d4.swift

@@ -1,4 +1,7 @@
 // {"signature":"swift::ProtocolConformanceRef::forAbstract(swift::Type, swift::ProtocolDecl*)"}
-// RUN: not --crash %target-swift-frontend -typecheck %s
+// RUN: env DYLD_INSERT_LIBRARIES=/usr/lib/libgmalloc.dylib not --crash %target-swift-frontend -typecheck %s
+// REQUIRES: OS=macosx
+// REQUIRES: target-same-as-host
+// REQUIRES: no_asan
 var sixDoubles
     : Double "six has the value [\( ( sixDoubles \[]) }0 \0\0 \0 \sixDoubles)"