chore: modernize WASM tests (#79)

I tried locally merge `fix-tests` and `fix-clippy` branches and CI
should work after my PRs

tests/fixtures/gas/branch.wat

@@ -3,25 +3,25 @@
 		(local $x i32) (local $y i32)
 
 		(block $unrolled_loop
-			(set_local $x (i32.const 0))
-			(set_local $y (i32.const 1))
+			(local.set $x (i32.const 0))
+			(local.set $y (i32.const 1))
 
-			get_local $x
-			get_local $y
-			tee_local $x
+			local.get $x
+			local.get $y
+			local.tee $x
 			i32.add
-			set_local $y
+			local.set $y
 
 			i32.const 1
 			br_if $unrolled_loop
 
-			get_local $x
-			get_local $y
-			tee_local $x
+			local.get $x
+			local.get $y
+			local.tee $x
 			i32.add
-			set_local $y
+			local.set $y
 		)
 
-		get_local $y
+		local.get $y
 	)
 )

tests/fixtures/gas/call.wat

@@ -2,18 +2,18 @@
 	(func $add_locals (param $x i32) (param $y i32) (result i32)
 		(local $t i32)
 
-		get_local $x
-		get_local $y
+		local.get $x
+		local.get $y
 		call $add
-		set_local $t
+		local.set $t
 
-		get_local $t
+		local.get $t
 	)
 
 	(func $add (param $x i32) (param $y i32) (result i32)
 		(i32.add
-			(get_local $x)
-			(get_local $y)
+			(local.get $x)
+			(local.get $y)
 		)
 	)
 )

tests/fixtures/gas/ifs.wat

@@ -2,8 +2,8 @@
 	(func (param $x i32) (result i32)
 		(if (result i32)
 			(i32.const 1)
-			(then (i32.add (get_local $x) (i32.const 1)))
-			(else (i32.popcnt (get_local $x)))
+			(then (i32.add (local.get $x) (i32.const 1)))
+			(else (i32.popcnt (local.get $x)))
 		)
 	)
 )