Keep loaded libraries after buildModel failure

We automatically load libraries from uses-annotations; this keeps the
libraries in memory even if translation fails.

We now also record frontend/etc timings for failed simulations.
Some code for handling normal simulations, FMUs, and XML export were
merged in order to avoid having mostly duplicate code lying around
(this code tends to get out of synch).

This fixes ticket:4255.

Belonging to [master]:
  - #2106
  - OpenModelica/OpenModelica-testsuite#820

Author: sjoelund

Compiler/FrontEnd/Absyn.mo

@@ -901,6 +901,8 @@ uniontype FunctionArgs "The FunctionArgs uniontype consists of a list of positio
 
 end FunctionArgs;
 
+constant FunctionArgs emptyFunctionArgs = FUNCTIONARGS({},{});
+
 uniontype ReductionIterType
   record COMBINE "Reductions are by default calculated as all combinations of the iterators"
   end COMBINE;

Compiler/Main/Main.mo

@@ -507,7 +507,7 @@ algorithm
         execStat("Parsed file");
 
         // Instantiate the program.
-        (cache, env, d, cname) = instantiate(p);
+        (p, cache, env, d, cname) = instantiate(p);
 
         d = if Flags.isSet(Flags.TRANSFORMS_BEFORE_DUMP) then DAEUtil.transformationsBeforeBackend(cache,env,d) else d;
 
@@ -588,7 +588,7 @@ protected function instantiate
   "Translates the Absyn.Program to SCode and instantiates either a given class
    specified by the +i flag on the command line, or the last class in the
    program if no class was specified."
-  input Absyn.Program program;
+  input output Absyn.Program program;
   output FCore.Cache cache;
   output FCore.Graph env;
   output DAE.DAElist dae;
@@ -602,7 +602,8 @@ algorithm
   // program. Otherwise, instantiate the given class name.
   cname := if stringEmpty(cls) then Absyn.lastClassname(program) else Absyn.stringPath(cls);
   st := GlobalScriptUtil.setSymbolTableAST(GlobalScript.emptySymboltable, program);
-  (cache, env, dae) := CevalScriptBackend.runFrontEnd(FCore.emptyCache(), FGraph.empty(), cname, st, true);
+  (cache, env, SOME(dae), st) := CevalScriptBackend.runFrontEnd(FCore.emptyCache(), FGraph.empty(), cname, st, true);
+  program := st.ast;
 end instantiate;
 
 protected function optimizeDae