Fix incorrect line numbers in linemarkers

[squeek502]

Line numbers are 1-indexed, not 0-indexed. Before this commit, include_start/include_resume tokens were being added with a mix of 1-indexed and 0-indexed line numbers. After this commit, all line numbers are 1-indexed.

Closes #604

I would have added test cases, but there's nothing in place for testing linemarkers (if I add a test case, the file paths in the line markers end up as absolute). For example, this test case:

//aro-args -E -fuse-line-directives
this is line 2







this is line 10

Expects this output:

#line 2 "/home/ryan/Programming/zig/arocc/test/cases/linemarkers.c"
this is line 2
#line 10 "/home/ryan/Programming/zig/arocc/test/cases/linemarkers.c"
this is line 10

Let me know if you have an idea of how to add test cases for this.

---

Fixes all the reproductions of the problem I was able to find.

---

#include "a.h"


foo

Now correctly outputs:

#line 1 "test.c"
#line 1 "<builtin>"
#line 293 "<builtin>"
#line 1 "<command line>"
#line 1 "test.c"
#line 1 "./a.h"

#line 4 "test.c"
foo

---

this is line 1








this is line 10

Now correctly outputs:

#line 1 "test.c"
#line 1 "<builtin>"
#line 293 "<builtin>"
#line 1 "<command line>"
#line 1 "test.c"
this is line 1
#line 10 "test.c"
this is line 10

[Vexu]

Thanks, looks like I confused myself by not being able to decide whether to zero or one index the line numbers when implementing linemarkers.