v: do a minor optimizations on cmd/v (#22880)

vlib/builtin/string.v

@@ -1394,7 +1394,7 @@ pub fn (s string) index_u8_last(c u8) int {
 }
 
 // last_index_u8 returns the index of the last occurrence of byte `c` if it was found in the string.
-@[inline]
+@[direct_array_access; inline]
 pub fn (s string) last_index_u8(c u8) int {
 	for i := s.len - 1; i >= 0; i-- {
 		if s[i] == c {

vlib/sync/stdatomic/atomic.c.v

@@ -9,24 +9,28 @@ module stdatomic
 // much more.
 
 // add_u64 adds provided delta as an atomic operation
+@[inline]
 pub fn add_u64(ptr &u64, delta int) u64 {
 	C.atomic_fetch_add_u64(voidptr(ptr), delta)
 	return *ptr
 }
 
 // sub_u64 subtracts provided delta as an atomic operation
+@[inline]
 pub fn sub_u64(ptr &u64, delta int) u64 {
 	C.atomic_fetch_sub_u64(voidptr(ptr), delta)
 	return *ptr
 }
 
 // add_i64 adds provided delta as an atomic operation
+@[inline]
 pub fn add_i64(ptr &i64, delta int) i64 {
 	C.atomic_fetch_add_u64(voidptr(ptr), delta)
 	return *ptr
 }
 
 // add_i64 subtracts provided delta as an atomic operation
+@[inline]
 pub fn sub_i64(ptr &i64, delta int) i64 {
 	C.atomic_fetch_sub_u64(voidptr(ptr), delta)
 	return *ptr
@@ -34,21 +38,25 @@ pub fn sub_i64(ptr &i64, delta int) i64 {
 
 // atomic store/load operations have to be used when there might be another concurrent access
 // atomicall set a value
+@[inline]
 pub fn store_u64(ptr &u64, val u64) {
 	C.atomic_store_u64(voidptr(ptr), val)
 }
 
 // atomicall get a value
+@[inline]
 pub fn load_u64(ptr &u64) u64 {
 	return C.atomic_load_u64(voidptr(ptr))
 }
 
 // atomicall set a value
+@[inline]
 pub fn store_i64(ptr &i64, val i64) {
 	C.atomic_store_u64(voidptr(ptr), val)
 }
 
 // atomicall get a value
+@[inline]
 pub fn load_i64(ptr &i64) i64 {
 	return i64(C.atomic_load_u64(voidptr(ptr)))
 }

vlib/v/ast/ast.v

@@ -2675,10 +2675,12 @@ pub fn (expr Expr) is_literal() bool {
 	}
 }
 
+@[inline]
 pub fn (e Expr) is_nil() bool {
 	return e is Nil || (e is UnsafeExpr && e.expr is Nil)
 }
 
+@[direct_array_access]
 pub fn type_can_start_with_token(tok &token.Token) bool {
 	return match tok.kind {
 		.name {

vlib/v/checker/checker.v

@@ -491,6 +491,7 @@ fn (mut c Checker) file_has_main_fn(file &ast.File) bool {
 	return has_main_fn
 }
 
+@[direct_array_access]
 fn (mut c Checker) check_valid_snake_case(name string, identifier string, pos token.Pos) {
 	if c.pref.translated || c.file.is_translated {
 		return

vlib/v/parser/parser.v

@@ -655,6 +655,7 @@ fn (mut p Parser) mark_last_call_return_as_used(mut last_stmt ast.Stmt) {
 	}
 }
 
+@[inline]
 fn (mut p Parser) next() {
 	p.prev_tok = p.tok
 	p.tok = p.peek_tok

vlib/v/scanner/scanner.v

@@ -1183,10 +1183,12 @@ fn (mut s Scanner) invalid_character() {
 	s.error('invalid character `${c}`')
 }
 
+@[inline]
 fn (s &Scanner) current_column() int {
 	return s.pos - s.last_nl_pos
 }
 
+@[direct_array_access]
 fn (s &Scanner) count_symbol_before(p int, sym u8) int {
 	mut count := 0
 	for i := p; i >= 0; i-- {