[clang] [llvm] [WebAssembly] support getVT from `externref` and `funcref` (PR #97080)

[Heejin Ahn via cfe-commits]

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+// RUN: %clang_cc1 -O2 -triple wasm32-unknown-unknown-wasm -target-feature +reference-types -emit-llvm -o - %s | FileCheck %s
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aheejin wrote:

By the way, this command succeeds even without this patch. The test should be something that fails now and succeeds with the fix.

https://github.com/llvm/llvm-project/pull/97080