[llvm] [WebAssembly] improve getRegForPromotedValue to avoid meanless value copy (PR #80469)

[Sam Clegg via llvm-commits]

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+; RUN: llc < %s -fast-isel -O0 | FileCheck %s
+
+target triple = "wasm32-unknown-unknown"
+
+; CHECK-LABEL: gh_80052:                               # @gh_80052
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sbc100 wrote:

Should this be 80053? 

https://github.com/llvm/llvm-project/pull/80469