[Wasm] Minor: move buildUnreachable* helpers to more specific module

compiler/ir/backend.wasm/src/org/jetbrains/kotlin/backend/wasm/ir2wasm/locationUtils.kt

@@ -8,6 +8,7 @@ package org.jetbrains.kotlin.backend.wasm.ir2wasm
 import org.jetbrains.kotlin.ir.IrElement
 import org.jetbrains.kotlin.ir.IrFileEntry
 import org.jetbrains.kotlin.ir.expressions.IrExpression
+import org.jetbrains.kotlin.wasm.ir.WasmExpressionBuilder
 import org.jetbrains.kotlin.wasm.ir.source.location.SourceLocation
 
 fun IrElement.getSourceLocation(fileEntry: IrFileEntry?): SourceLocation {
@@ -21,3 +22,16 @@ fun IrElement.getSourceLocation(fileEntry: IrFileEntry?): SourceLocation {
 
     return SourceLocation.Location(path, startLine, startColumn)
 }
+
+fun WasmExpressionBuilder.buildUnreachableForVerifier() {
+    buildUnreachable(SourceLocation.NoLocation("This instruction should never be reached, but required for wasm verifier"))
+}
+
+fun WasmExpressionBuilder.buildUnreachableAfterNothingType() {
+    buildUnreachable(
+        SourceLocation.NoLocation(
+            "The unreachable instruction after an expression with Nothing type to make sure that " +
+                    "execution doesn't come here (or it fails fast if so). It also might be required for wasm verifier."
+        )
+    )
+}

wasm/wasm.ir/src/org/jetbrains/kotlin/wasm/ir/WasmExpressionBuilder.kt

@@ -206,16 +206,3 @@ abstract class WasmExpressionBuilder {
         buildInstr(WasmOp.PSEUDO_COMMENT_GROUP_END)
     }
 }
-
-fun WasmExpressionBuilder.buildUnreachableForVerifier() {
-    buildUnreachable(SourceLocation.NoLocation("This instruction should never be reached, but required for wasm verifier"))
-}
-
-fun WasmExpressionBuilder.buildUnreachableAfterNothingType() {
-    buildUnreachable(
-        SourceLocation.NoLocation(
-            "The unreachable instruction after an expression with Nothing type to make sure that " +
-                    "execution doesn't come here (or it fails fast if so). It also might be required for wasm verifier."
-        )
-    )
-}