JVM IR: clear BindingContext after psi2ir

This helps to reduce peak memory in lowerings/codegen by a lot.

A more robust approach would be to have a separate BindingContext for
each file, and clear each of them after running psi2ir on it. This would
also lower peak memory usage in psi2ir.

Provide a fallback workaround compiler argument
-Xir-do-not-clear-binding-context just in case BindingContext is in fact
used somewhere and it's not caught by tests.

idea/jvm-debugger/jvm-debugger-test/test/org/jetbrains/kotlin/idea/debugger/test/DebuggerTestCompilerFacility.kt

@@ -169,6 +169,7 @@ class DebuggerTestCompilerFacility(
         val configuration = CompilerConfiguration()
         configuration.put(JVMConfigurationKeys.JVM_TARGET, jvmTarget)
         configuration.put(JVMConfigurationKeys.IR, useIrBackend)
+        configuration.put(JVMConfigurationKeys.DO_NOT_CLEAR_BINDING_CONTEXT, true)
 
         val state = GenerationUtils.generateFiles(project, files, configuration, ClassBuilderFactories.BINARIES, analysisResult) {
             generateDeclaredClassFilter(GenerationState.GenerateClassFilter.GENERATE_ALL)