compiler: remove dead code (a tcc bug fix)

vlib/compiler/compile_errors.v

@@ -225,28 +225,8 @@ fn (s mut Scanner) get_scanner_pos_of_token(t &Token) ScannerPos {
 	// of the token.
 	s.goto_scanner_position(ScannerPos{})
 
-	mut prevlinepos := 0
-	// NB: TCC BUG workaround: removing the `mut ate:=0 ate++` line
-	// below causes a bug in v, when v is compiled with tcc, and v
-	// wants to report the error: 'the following imports were never used:'
-	//
-	// This can be reproduced, if you follow the steps:
-	// a) ./v -cc tcc -o v compiler ;
-	// b) ./v vlib/builtin/hashmap_test.v'
-	//
-	// In this case, prevlinepos gets a random value on each run.
-	// Any kind of operation may be used seemingly, as long as
-	// there is a new stack allocation that will 'protect' prevlinepos.
-	//////////////////////////////////////////////////////////////////
-	mut ate:=0 ate++ // This var will be smashed by TCC, instead of
-	/////////////////// prevlinepos. The cause is the call to
-	/////////////////// s.get_scanner_pos()
-	/////////////////// which just returns a struct, and that works
-	/////////////////// in gcc and clang, but causes the TCC problem.
-
 	maxline := imin( s.nlines, tline + 2 * error_context_after)
 	for {
-		prevlinepos = s.pos
 		if s.pos >= s.text.len { break }		
 		if s.line_nr > maxline { break }
 		////////////////////////////////////////