[Bug target/106096] [13 regression] ICE building stage 2 libgcc on loongarch64-linux-gnu since r13-911

[xry111 at mengyan1223 dot wang]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106096

--- Comment #2 from Xi Ruoyao <xry111 at mengyan1223 dot wang> ---
Created attachment 53208
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53208&action=edit
reduced testcase

It looks like a LoongArch code generation issue, not really related to the
changes in r13-911.