[flang] Fix reversed comparison in RESHAPE() runtime

[klausler]

Summary

RESHAPE() fails inappropriately at runtime if the source array
is larger than the result -- which is perfectly valid -- because
of an obviously reversed comparison of their numbers of elements
is activating the runtime asserts meant for the opposite case
(source smaller than result).

[PeteSteinfeld]

All builds, tests, and looks good.

flang/runtime/transformational.cpp

   std::size_t elementBytes{source.ElementBytes()};
   std::size_t sourceElements{source.Elements()};
   std::size_t padElements{pad ? pad->Elements() : 0};
-  if (resultElements < sourceElements) {
+  if (resultElements > sourceElements) {
     RUNTIME_CHECK(terminator, padElements > 0);
     RUNTIME_CHECK(terminator, pad->ElementBytes() == elementBytes);
   }