[Backport to 17] add reverse translation for OpDecorateString and OpMemberDecorateString #2775
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This PR adds "reverse translation" (from SPIR-V to LLVM IR) support for OpDecorateString and OpMemberDecorateString, see #2460 and #2670. These instructions are currently treated as synonyms for OpDecorate and OpMemberDecorate. We'll want to tidy this up at some point, but at least for now we won't crash if we see these instructions.
I'll still need to add proper support for decorating variables in the input storage class for #2670, but I'll do that in a separate PR.
(cherry picked from commit f7057b4)