IR: Adds support for printing strings

I utilize this functionality quite heavily when debugging and I need
bread crumbs spread around. Instead of reimplementing it a dozen times,
just have it upstreamed.

FEXCore/Source/Interface/IR/IRDumper.cpp

@@ -38,6 +38,10 @@ static void PrintArg(fextl::stringstream* out, const IRListView*, uint64_t Arg)
   *out << fextl::fmt::format("#{:#x}", Arg);
 }
 
+static void PrintArg(fextl::stringstream* out, const IRListView*, const char* const Arg) {
+  *out << fextl::fmt::format("'{}'", Arg);
+}
+
 static void PrintArg(fextl::stringstream* out, const IRListView*, CondClass Arg) {
   if (Arg == CondClass::AL) {
     *out << "ALWAYS";