Introduce support for plugin-defined intrinsics in JVM IR backend:

Add intrinsic for kotlinx.serialization.serializer<T>() function.

Plugin intrinsic for old backend is removed because it is too hard
and unjustifiable to unify them.

compiler/ir/backend.jvm/codegen/src/org/jetbrains/kotlin/backend/jvm/codegen/IrInlineIntrinsicsSupport.kt

@@ -5,6 +5,8 @@
 
 package org.jetbrains.kotlin.backend.jvm.codegen
 
+import org.jetbrains.kotlin.backend.common.extensions.IrGenerationExtension
+import org.jetbrains.kotlin.backend.jvm.JvmBackendContext
 import org.jetbrains.kotlin.backend.jvm.intrinsics.SignatureString
 import org.jetbrains.kotlin.backend.jvm.ir.getCallableReferenceOwnerKClassType
 import org.jetbrains.kotlin.backend.jvm.ir.getCallableReferenceTopLevelFlag
@@ -12,12 +14,14 @@ import org.jetbrains.kotlin.builtins.jvm.JavaToKotlinClassMap
 import org.jetbrains.kotlin.codegen.AsmUtil
 import org.jetbrains.kotlin.codegen.inline.ReifiedTypeInliner
 import org.jetbrains.kotlin.codegen.state.GenerationState
+import org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI
 import org.jetbrains.kotlin.ir.declarations.*
 import org.jetbrains.kotlin.ir.descriptors.toIrBasedKotlinType
 import org.jetbrains.kotlin.ir.expressions.IrExpression
 import org.jetbrains.kotlin.ir.symbols.IrTypeParameterSymbol
 import org.jetbrains.kotlin.ir.types.IrType
 import org.jetbrains.kotlin.ir.types.classOrNull
+import org.jetbrains.kotlin.ir.types.toKotlinType
 import org.jetbrains.kotlin.ir.util.allParametersCount
 import org.jetbrains.kotlin.ir.util.defaultType
 import org.jetbrains.kotlin.ir.util.fqNameWhenAvailable
@@ -31,6 +35,8 @@ import org.jetbrains.org.objectweb.asm.Type
 import org.jetbrains.org.objectweb.asm.Type.INT_TYPE
 import org.jetbrains.org.objectweb.asm.Type.VOID_TYPE
 import org.jetbrains.org.objectweb.asm.commons.InstructionAdapter
+import org.jetbrains.org.objectweb.asm.tree.InsnList
+import org.jetbrains.org.objectweb.asm.tree.MethodInsnNode
 
 class IrInlineIntrinsicsSupport(
     private val classCodegen: ClassCodegen,
@@ -120,4 +126,22 @@ class IrInlineIntrinsicsSupport(
         classCodegen.context.ktDiagnosticReporter.at(reportErrorsOn, containingFile)
             .report(JvmBackendErrors.TYPEOF_NON_REIFIED_TYPE_PARAMETER_WITH_RECURSIVE_BOUND, typeParameterName.asString())
     }
+
+    override fun applyPluginDefinedReifiedOperationMarker(
+        insn: MethodInsnNode,
+        instructions: InsnList,
+        type: IrType,
+        asmType: Type
+    ): Int {
+        return IrGenerationExtension.getInstances(classCodegen.context.state.project)
+            .map {
+                it.applyPluginDefinedReifiedOperationMarker(
+                    insn,
+                    instructions,
+                    type,
+                    classCodegen.context
+                )
+            }
+            .maxOrNull() ?: -1
+    }
 }