Rollup merge of #94143 - est31:let_else_const_eval, r=lcnr

rustc_const_eval: adopt let else in more places

Continuation of #89933, #91018, #91481, #93046, #93590, #94011.

I have extended my clippy lint to also recognize tuple passing and match statements. The diff caused by fixing it is way above 1 thousand lines. Thus, I split it up into multiple pull requests to make reviewing easier. This PR handles rustc_const_eval.

compiler/rustc_const_eval/src/interpret/validity.rs

@@ -851,12 +851,9 @@ impl<'rt, 'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> ValueVisitor<'mir, 'tcx, M>
                 // to reject those pointers, we just do not have the machinery to
                 // talk about parts of a pointer.
                 // We also accept uninit, for consistency with the slow path.
-                let alloc = match self.ecx.memory.get(mplace.ptr, size, mplace.align)? {
-                    Some(a) => a,
-                    None => {
-                        // Size 0, nothing more to check.
-                        return Ok(());
-                    }
+                let Some(alloc) = self.ecx.memory.get(mplace.ptr, size, mplace.align)? else {
+                    // Size 0, nothing more to check.
+                    return Ok(());
                 };
 
                 let allow_uninit_and_ptr = !M::enforce_number_validity(self.ecx);