Don't wrap ProcessCanceledException with other exceptions

ProcessCanceledException indicates that the compilation process was
terminated by user. This kind of exception should not be wrapped anyhow
in order to be handled on toplevel in CLICompiler.
#KT-38483 Fixed

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

@@ -5,6 +5,7 @@
 
 package org.jetbrains.kotlin.backend.jvm.codegen
 
+import com.intellij.openapi.progress.ProcessCanceledException
 import org.jetbrains.kotlin.backend.common.lower.BOUND_RECEIVER_PARAMETER
 import org.jetbrains.kotlin.backend.common.lower.BOUND_VALUE_PARAMETER
 import org.jetbrains.kotlin.backend.jvm.JvmLoweredDeclarationOrigin
@@ -42,6 +43,8 @@ class FunctionCodegen(private val irFunction: IrFunction, private val classCodeg
     ): SMAPAndMethodNode =
         try {
             doGenerate(reifiedTypeParameters)
+        } catch (e: ProcessCanceledException) {
+            throw e
         } catch (e: Throwable) {
             throw RuntimeException("Exception while generating code for:\n${irFunction.dump()}", e)
         }