Bug 1839396 part 2 - GenericPrinter: avoid double exception report. r=mgaudet

The `GenericPrinterPrintTarget` uses the same `GenericPrinter`, which already
handles the out-of-memory reporting. Thus, there is no need to report it once
more in `GenericPrinter::vprintf`.

Differential Revision: https://phabricator.services.mozilla.com/D181487

js/src/vm/Printer.cpp

@@ -62,11 +62,7 @@ bool GenericPrinter::vprintf(const char* fmt, va_list ap) {
   }
 
   GenericPrinterPrintfTarget printer(*this);
-  if (!printer.vprint(fmt, ap)) {
-    reportOutOfMemory();
-    return false;
-  }
-  return true;
+  return printer.vprint(fmt, ap);
 }
 
 const size_t Sprinter::DefaultSize = 64;