[mlir][omp] Add omp.tile operation (#160292)

Add the `omp.tile` loop transformations for the OpenMP dialect. Used for
lowering a standalone `!$omp tile` in Flang.

Author: Meinersbur

mlir/tools/mlir-tblgen/AttrOrTypeFormatGen.cpp

@@ -403,6 +403,7 @@ void DefFormat::genLiteralParser(StringRef value, FmtContext &ctx,
               .Case("]", "RSquare")
               .Case("?", "Question")
               .Case("+", "Plus")
+              .Case("-", "Minus")
               .Case("*", "Star")
               .Case("...", "Ellipsis")
        << "()";

mlir/tools/mlir-tblgen/FormatGen.cpp

@@ -518,7 +518,7 @@ bool mlir::tblgen::isValidLiteral(StringRef value,
   // If there is only one character, this must either be punctuation or a
   // single character bare identifier.
   if (value.size() == 1) {
-    StringRef bare = "_:,=<>()[]{}?+*";
+    StringRef bare = "_:,=<>()[]{}?+-*";
     if (isalpha(front) || bare.contains(front))
       return true;
     if (emitError)

mlir/tools/mlir-tblgen/OpFormatGen.cpp

@@ -852,6 +852,7 @@ static void genLiteralParser(StringRef value, MethodBody &body) {
               .Case("]", "RSquare()")
               .Case("?", "Question()")
               .Case("+", "Plus()")
+              .Case("-", "Minus()")
               .Case("*", "Star()")
               .Case("...", "Ellipsis()");
 }