Do not wrap and display cause's message in compiler exceptions

In case the wrapped exception message contains some long text (bytecode,
IR, etc.), it could be displayed several times in the same stack trace,
which significantly worsened the experience of parsing such stack traces

compiler/frontend/src/org/jetbrains/kotlin/util/exceptionUtil.kt

@@ -13,29 +13,18 @@ fun getExceptionMessage(
     cause: Throwable?,
     location: String?
 ): String = ApplicationManager.getApplication().runReadAction<String> {
-    val result = StringBuilder(subsystemName + " Internal error: ").append(message).append("\n")
-    if (cause != null) {
-        val causeMessage = cause.message
-        result.append("Cause: ").append(causeMessage ?: cause.toString()).append("\n")
-    }
+    buildString {
+        append(subsystemName).append(" Internal error: ").appendln(message)
 
-    if (location != null) {
-        result.append("File being compiled at position: ").append(location).append("\n")
-    } else {
-        result.append("Element is unknown")
-    }
+        if (location != null) {
+            append("File being compiled at position: ").appendln(location)
+        } else {
+            append("Element is unknown")
+        }
 
-    if (cause != null) {
-        result.append("The root cause was thrown at: ").append(where(cause))
+        if (cause != null) {
+            append("The root cause ${cause::class.java.name} was thrown at: ")
+            append(cause.stackTrace?.firstOrNull()?.toString() ?: "unknown")
+        }
     }
-
-    result.toString()
-}
-
-private fun where(cause: Throwable): String {
-    val stackTrace = cause.stackTrace
-    if (stackTrace != null && stackTrace.size > 0) {
-        return stackTrace[0].fileName + ":" + stackTrace[0].lineNumber
-    }
-    return "unknown"
 }