[flang] min/max intrinsics are wrongly being interpreted as semantically valid

[NimishMishra]

flang-new currently does not report any error for statements like the following:

integer :: x

x = min(x)
x = max(x)

whereas both require at least two arguments. gfortran correctly reports error on these statements

[llvmbot]

@llvm/issue-subscribers-flang-frontend

[kkwli]

Working on the patch for this issue and I found another issue.

b = max()

fatal internal error: CHECK(operandArg) failed at llvm-project/flang/lib/Evaluate/intrinsics.cpp(2048)

#58921 is opened to track this issue.