Charge gas for local variables on the callee side (#38)

Co-authored-by: Alexander Theißen <alex.theissen@me.com>

tests/expectations/gas/branch_host_fn.wat

@@ -4,7 +4,7 @@
   (import "env" "gas" (func (;0;) (type 1)))
   (func $fibonacci_with_break (;1;) (type 0) (result i32)
     (local i32 i32)
-    i64.const 13
+    i64.const 15
     call 0
     block ;; label = @1
       i32.const 0

tests/expectations/gas/branch_mut_global.wat

@@ -3,7 +3,7 @@
   (type (;1;) (func (param i64)))
   (func $fibonacci_with_break (;0;) (type 0) (result i32)
     (local $x i32) (local $y i32)
-    i64.const 24
+    i64.const 26
     call 1
     block ;; label = @1
       i32.const 0

tests/expectations/gas/call_host_fn.wat

@@ -4,7 +4,7 @@
   (import "env" "gas" (func (;0;) (type 1)))
   (func $add_locals (;1;) (type 0) (param $x i32) (param $y i32) (result i32)
     (local i32)
-    i64.const 5
+    i64.const 6
     call 0
     local.get $x
     local.get $y

tests/expectations/gas/call_mut_global.wat

@@ -3,7 +3,7 @@
   (type (;1;) (func (param i64)))
   (func $add_locals (;0;) (type 0) (param $x i32) (param $y i32) (result i32)
     (local $t i32)
-    i64.const 16
+    i64.const 17
     call 2
     local.get $x
     local.get $y