Fix for pattern types causing ICE in debuginfo generation #145716
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rustbot added A-LLVM 
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This PR fixes #145514 where pattern types would cause an ICE when generating debug info. The issue was that the compiler didn't know how to handle
ty::Pattypes in the debuginfo metadata generation.The pattern types are refinement types that have the same runtim representation as their underlying type, so I just generate a
typedefin the debuginfo that points to the inner type but uses the pattern type's name. It would give debuggers the right information.