tests: don't run AutoDiff/compiler_crashers_fixed/58660-conflicting-debug-info-inlining.swift on linux

Author: eeckstein

test/AutoDiff/compiler_crashers_fixed/58660-conflicting-debug-info-inlining.swift

@@ -2,7 +2,7 @@
 // RUN: %target-swift-frontend -emit-sil -O -g %s | %FileCheck %s
 
 // REQUIRES: swift_in_compiler
-// XFAIL: OS=linux
+// UNSUPPORTED: OS=linux-gnu
 
 // Issue #58660: Specifically-shaped differentiable functions yield "conflicting debug info for argument" assertion failure
 // Ensure that proper location is preserved after sil-mem2reg location-less stores (created during inlining)