[PATCH PR d/88958] Committed fix for ICE in walk_aliased_vdefs_1

[Iain Buclaw]

Hi,

This patch merges the D front-end implementation with dmd upstream
0fc786f49, fixing PR d/88958.

Bootstrapped and regression tested on x86_64-linux-gnu.

Committed to trunk as r269557.

-- 
Iain
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