use -d:nimCompilerStackraceHints in more places

[timotheecour]

followup for #13351

this helped a lot when doing the code reduction in #14340 (comment)

before PR:

at devel 0b7847b:

git clone https://gitea.com/BarrOff/nimPoP.git
cd nimPoP
nim c src/nimPoP.nim
/Users/timothee/git_clone/nim/Nim_devel/lib/system/fatal.nim(49) sysFatal
Error: unhandled exception: 'sons' is not accessible using discriminant 'kind' of type 'TNode' [FieldDefect]

before PR, with debug nim

after recompiling nim with --stacktrace:on --stacktracemsgs -d:nimCompilerStackraceHints

/Users/timothee/git_clone/nim/Nim_prs/compiler/ccgexprs.nim(1020) genBracketExpr
/Users/timothee/git_clone/nim/Nim_prs/compiler/ccgexprs.nim(911) genArrayElem
/Users/timothee/git_clone/nim/Nim_prs/compiler/cgen.nim(619) initLocExpr
/Users/timothee/git_clone/nim/Nim_prs/compiler/ccgexprs.nim(2674) expr
/Users/timothee/git_clone/nim/Nim_prs/compiler/ccgexprs.nim(2524) genComplexConst
/Users/timothee/git_clone/nim/Nim_prs/compiler/cgen.nim(1207) requestConstImpl
/Users/timothee/git_clone/nim/Nim_prs/compiler/ccgexprs.nim(3111) genBracedInit
/Users/timothee/git_clone/nim/Nim_prs/compiler/ccgexprs.nim(3013) genConstSimpleList
/Users/timothee/git_clone/nim/Nim_prs/compiler/ccgexprs.nim(3092) genBracedInit
/Users/timothee/git_clone/nim/Nim_prs/compiler/ast.nim(1115) len
/Users/timothee/git_clone/nim/Nim_prs/lib/system/fatal.nim(49) sysFatal
Error: unhandled exception: 'sons' is not accessible using discriminant 'kind' of type 'TNode' [FieldDefect]

=> gives 0 indication of what part of the code being cgen'd causes the error

after PR

after recompiling nim with --stacktrace:on --stacktracemsgs -d:nimCompilerStackraceHints

=> now we know its' inside this: /Users/timothee/git_clone/nim/temp/nimPoP/src/nimPoP/opl3.nim(657, 16) nkSym, and also mroe this is called from, etc

/Users/timothee/git_clone/nim/Nim_prs/compiler/ccgcalls.nim(401) genClosureCall
/Users/timothee/git_clone/nim/Nim_prs/compiler/cgen.nim(619) initLocExpr
/Users/timothee/git_clone/nim/Nim_prs/compiler/ccgexprs.nim(2771) expr /Users/timothee/git_clone/nim/temp/nimPoP/src/nimPoP/opl3.nim(657, 27) nkBracketExpr
/Users/timothee/git_clone/nim/Nim_prs/compiler/ccgexprs.nim(1023) genBracketExpr
/Users/timothee/git_clone/nim/Nim_prs/compiler/ccgexprs.nim(914) genArrayElem
/Users/timothee/git_clone/nim/Nim_prs/compiler/cgen.nim(619) initLocExpr
/Users/timothee/git_clone/nim/Nim_prs/compiler/ccgexprs.nim(2679) expr /Users/timothee/git_clone/nim/temp/nimPoP/src/nimPoP/opl3.nim(657, 16) nkSym
/Users/timothee/git_clone/nim/Nim_prs/compiler/ccgexprs.nim(2527) genComplexConst
/Users/timothee/git_clone/nim/Nim_prs/compiler/cgen.nim(1207) requestConstImpl
/Users/timothee/git_clone/nim/Nim_prs/compiler/ccgexprs.nim(3116) genBracedInit
/Users/timothee/git_clone/nim/Nim_prs/compiler/ccgexprs.nim(3018) genConstSimpleList
/Users/timothee/git_clone/nim/Nim_prs/compiler/ccgexprs.nim(3097) genBracedInit
/Users/timothee/git_clone/nim/Nim_prs/compiler/ast.nim(1115) len
/Users/timothee/git_clone/nim/Nim_prs/lib/system/fatal.nim(49) sysFatal
Error: unhandled exception: 'sons' is not accessible using discriminant 'kind' of type 'TNode' [FieldDefect]

future work

• extend -d:nimCompilerStackraceHints to a few more key strategic places
• make compiler use conf.isDefined instead of defined so that we don't need to recompile nim just to get nimCompilerStackraceHints enabled (as long as nim was already compiled with --stacktrace:on --stacktracemsgs)