big progress: The backend is per-module and memory consumption is excellent

tests/codegen/titaniummangle_nim.nim

@@ -1,7 +1,7 @@
 discard """
   targets: "c"
   matrix: "--debugger:native --mangle:nim"
-  ccodecheck: "'testFunc__titaniummangle95nim_u'"
+  ccodecheck: "'testFunc_u' \\d+ '__titaniummangle95nim'"
 """
 
 #When debugging this notice that if one check fails, it can be due to any of the above.

tests/js/tcodegendeclproc.nim

@@ -3,7 +3,7 @@ discard """
 -1
 8
 '''
-  ccodecheck: "'console.log(-1); function fac__tcodegendeclproc_u' \\d+ '(n_p0)'"
+  ccodecheck: "'console.log(-1); function fac_u' \\d+ '__tcodegendeclproc(n_p0)'"
 """
 proc fac(n: int): int {.codegenDecl: "console.log(-1); function $2($3)".} =
   return n