[IR] Drop alwaysCreateTemporaryVariablesForArguments from inliner

This parameter was always set to be true.

#KT-66509

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/JsLoweringPhases.kt

@@ -207,7 +207,6 @@ private val functionInliningPhase = makeIrModulePhase(
             it,
             JsInlineFunctionResolver(it),
             it.innerClassesSupport,
-            alwaysCreateTemporaryVariablesForArguments = true,
             inlineArgumentsWithOriginalOffset = true,
         )
     },

compiler/ir/backend.jvm/lower/src/org/jetbrains/kotlin/backend/jvm/JvmLoweringPhases.kt

@@ -297,7 +297,6 @@ internal val functionInliningPhase = makeIrModulePhase(
         FunctionInlining(
             context,
             innerClassesSupport = context.innerClassesSupport,
-            alwaysCreateTemporaryVariablesForArguments = true,
             regenerateInlinedAnonymousObjects = true,
             inlineArgumentsWithOriginalOffset = true
         )

compiler/ir/backend.wasm/src/org/jetbrains/kotlin/backend/wasm/WasmLoweringPhases.kt

@@ -139,7 +139,6 @@ private val functionInliningPhase = makeCustomPhase<WasmBackendContext>(
             inlineFunctionResolver = WasmInlineFunctionResolver(context),
             innerClassesSupport = context.innerClassesSupport,
             insertAdditionalImplicitCasts = true,
-            alwaysCreateTemporaryVariablesForArguments = true
         ).inline(module)
         module.patchDeclarationParents()
     },

compiler/ir/ir.inline/src/org/jetbrains/kotlin/ir/inline/FunctionInlining.kt

@@ -80,7 +80,6 @@ class FunctionInlining(
     private val inlineFunctionResolver: InlineFunctionResolver = InlineFunctionResolver.TRIVIAL,
     private val innerClassesSupport: InnerClassesSupport? = null,
     private val insertAdditionalImplicitCasts: Boolean = false,
-    private val alwaysCreateTemporaryVariablesForArguments: Boolean = false,
     private val regenerateInlinedAnonymousObjects: Boolean = false,
     private val inlineArgumentsWithOriginalOffset: Boolean = false,
 ) : IrElementTransformerVoidWithContext(), BodyLoweringPass {
@@ -769,9 +768,7 @@ class FunctionInlining(
 
                 // Arguments may reference the previous ones - substitute them.
                 val variableInitializer = argument.argumentExpression.transform(substitutor, data = null)
-                val shouldCreateTemporaryVariable =
-                    (alwaysCreateTemporaryVariablesForArguments && !parameter.isInlineParameter()) ||
-                            argument.shouldBeSubstitutedViaTemporaryVariable()
+                val shouldCreateTemporaryVariable = !parameter.isInlineParameter() || argument.shouldBeSubstitutedViaTemporaryVariable()
 
                 if (shouldCreateTemporaryVariable) {
                     val newVariable = createTemporaryVariable(parameter, variableInitializer, argument.isDefaultArg, callee)
@@ -835,9 +832,7 @@ class FunctionInlining(
                 }
             )
 
-            if (alwaysCreateTemporaryVariablesForArguments) {
-                variable.name = Name.identifier(parameter.name.asStringStripSpecialMarkers())
-            }
+            variable.name = Name.identifier(parameter.name.asStringStripSpecialMarkers())
 
             return variable
         }

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/driver/phases/NativeLoweringPhases.kt

@@ -347,7 +347,6 @@ private val inlinePhase = createFileLoweringPhase(
                     FunctionInlining(
                             context.context,
                             NativeInlineFunctionResolver(context.context, context),
-                            alwaysCreateTemporaryVariablesForArguments = true,
                             insertAdditionalImplicitCasts = true,
                     ).lower(irFile)
                 }