Fix miscompilation of relinking over local.get

Author: kateinoigakukun

FuzzTesting/FailCases/FuzzDifferential/diff-29888.wasm

@@ -1454,6 +1454,7 @@ struct InstructionTranslator<Context: TranslatorContext>: InstructionVisitor {
         }
     }
     mutating func visitLocalGet(localIndex: UInt32) throws -> Output {
+        iseqBuilder.resetLastEmission()
         try valueStack.pushLocal(localIndex, locals: &locals)
     }
     mutating func visitLocalSetOrTee(localIndex: UInt32, isTee: Bool) throws {

Sources/WasmKit/Translator.swift

@@ -34,3 +34,17 @@
 )
 
 (assert_return (invoke "check") (i32.const 0))
+
+(module
+  (func (export "invalidate-relink") (param i32 i32) (result i32)
+      (i32.add (i32.const 1) (i32.const 42))
+      ;; This local.get should invalidate the relinking
+      ;; connection of i32.add even though it doesn't
+      ;; emit its own instruction.
+      (local.get 1)
+      (local.set 0)
+      (local.get 0)
+  )
+)
+
+(assert_return (invoke "invalidate-relink" (i32.const 1) (i32.const 2)) (i32.const 2))