[MLIR][OpenMP] Fix type mismatch in linear clause for INTEGER(8) variables (#173982) Fixes #173332 The compiler was crashing when compiling OpenMP `parallel do simd` with a `linear` clause on `INTEGER(8)` variables. The assertion failure occurred during MLIR-to-LLVM translation: Cannot create binary operator with two operands of differing type! **Root Cause:** The bug was in `LinearClauseProcessor::updateLinearVar()` where the step value (i32) and induction variable were multiplied without normalizing to the linear variable's type (i64), causing type mismatches in LLVM IR generation. **Solution:** Updated the translation logic to cast both the induction variable and step value to `linearVarTypes[index]` before performing arithmetic operations. This ensures type consistency for both integer and floating-point linear variables. **Testing:** - Added integration test verifying successful compilation to LLVM IR - Added lowering test for MLIR generation with various linear clause forms - Verified the exact reproducer from the issue now compiles without errors
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