Updates Benchmark macro parsing to use Generic Argument (#13919)

* WIP

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Removes POC code

* Adds assertion and UT

* adds runtime error

* removes const_assert

* ".git/.scripts/commands/fmt/fmt.sh"

---------

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Co-authored-by: command-bot <>

substrate/frame/support/test/tests/benchmark_ui/bad_param_range.rs

@@ -1,16 +0,0 @@
-use frame_benchmarking::v2::*;
-#[allow(unused_imports)]
-use frame_support_test::Config;
-
-#[benchmarks]
-mod benches {
-	use super::*;
-
-	#[benchmark]
-	fn bench(x: Linear<3, 1>) {
-		#[block]
-		{}
-	}
-}
-
-fn main() {}

substrate/frame/support/test/tests/benchmark_ui/bad_param_range.stderr

@@ -1,5 +0,0 @@
-error: The start of a `ParamRange` must be less than or equal to the end
-  --> tests/benchmark_ui/bad_param_range.rs:10:21
-   |
-10 |     fn bench(x: Linear<3, 1>) {
-   |                        ^

substrate/frame/support/test/tests/benchmark_ui/pass/valid_const_expr.rs

@@ -0,0 +1,28 @@
+use frame_benchmarking::v2::*;
+use frame_support_test::Config;
+use frame_support::parameter_types;
+
+#[benchmarks]
+mod benches {
+	use super::*;
+
+	const MY_CONST: u32 = 100;
+
+	const fn my_fn() -> u32 {
+		200
+	}
+
+	parameter_types! {
+		const MyConst: u32 = MY_CONST;
+	}
+
+	#[benchmark(skip_meta, extra)]
+	fn bench(a: Linear<{MY_CONST * 2}, {my_fn() + MyConst::get()}>) {
+		let a = 2 + 2;
+		#[block]
+		{}
+		assert_eq!(a, 4);
+	}
+}
+
+fn main() {}