[clang] [clang][OpenMP] Add error for large expr in collapse clause (PR #138592)

[Shafik Yaghmour via cfe-commits]

================
@@ -15901,6 +15901,13 @@ ExprResult 
SemaOpenMP::VerifyPositiveIntegerConstantInClause(
         << E->getSourceRange();
     return ExprError();
   }
+
+  if (!Result.isRepresentableByInt64()) {
----------------
shafik wrote:

So these are always 64 bit integers? This: 
https://www.openmp.org/spec-html/5.2/openmpsu30.html#x60-620004.4.3, 
"expression of integer type" 

https://github.com/llvm/llvm-project/pull/138592
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