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5d103763b9
this fixes an ICE introduced by the fix for PR middle-end/97078 where use_register_for_decl was changed to return true at -O0 for a parameter of a thunk. It turns out that we need to do the same for a result in this case. gcc/ChangeLog: PR middle-end/98082 * function.c (use_register_for_decl): Also return true for a result if cfun->tail_call_marked is true. gcc/testsuite/ChangeLog: * g++.dg/cpp2a/pr98082.C: New test.
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