[clang] [Clang] skip default argument instantiation for non-defining friend declarations without specialization info to meet [dcl.fct.default] p4 (PR #113777)

[Alan Zhao via cfe-commits]

alanzhao1 wrote:

> Reverted. The issue looks like the instantiation of the default argument was 
> skipped, but without any previous error actually being produced, so it 
> proceeded to CodeGen with invalid AST.

Thanks! Still waiting on CReduce for that repro.

https://github.com/llvm/llvm-project/pull/113777
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