Extend GCC workaround to GCC < 8.4 for llvm::iterator_range ctor (llvm#82643)

GCC SFINAE error with decltype was fixed in commit
ac5e28911abdfb8d9bf6bea980223e199bbcf28d which made it into GCC 8.4.
Therefore adjust GCC version test accordingly.

Author: RoboTux

llvm/include/llvm/ADT/iterator_range.h

@@ -43,8 +43,8 @@ class iterator_range {
   IteratorT begin_iterator, end_iterator;
 
 public:
-#if __GNUC__ == 7
-  // Be careful no to break gcc-7 on the mlir target.
+#if __GNUC__ == 7 || (__GNUC__ == 8 && __GNUC_MINOR__ < 4)
+  // Be careful no to break gcc-7 and gcc-8 < 8.4 on the mlir target.
   // See https://github.com/llvm/llvm-project/issues/63843
   template <typename Container>
 #else