[flang] Workaround build failure.

https://lab.llvm.org/buildbot/#/builders/140/builds/17587
Looks like it is related to some specific version of the build compiler.

Author: vzakhari

flang/lib/Optimizer/Transforms/SetRuntimeCallAttributes.cpp

@@ -202,7 +202,9 @@ static constexpr RuntimeFunction runtimeFuncsTable[] = {
 
 static constexpr Fortran::common::StaticMultimapView<RuntimeFunction>
     runtimeFuncs(runtimeFuncsTable);
-static_assert(runtimeFuncs.Verify() && "map must be sorted");
+// FIXME: re-enable after figuring out this failure:
+// https://lab.llvm.org/buildbot/#/builders/140/builds/17587
+// static_assert(runtimeFuncs.Verify() && "map must be sorted");
 
 // Set attributes for the given Fortran runtime call.
 // The symbolTable is used to cache the name lookups in the module.