Fix GC memory issue when building FMU (#11860)

- Double the capacity when adding an element to a full ExpandableArray
  instead of only increasing the capacity by one, to avoid massive
  allocations when adding a lot of elements one by one.

OMCompiler/Compiler/Util/ExpandableArray.mo

@@ -149,7 +149,13 @@ protected
 algorithm
   if index > 0 and (index > capacity or isNone(Dangerous.arrayGetNoBoundsChecking(data, index))) then
     if index > capacity then
-      expandToSize(index, exarray);
+      capacity := max(capacity, 1);
+
+      while index > capacity loop
+        capacity := capacity * 2;
+      end while;
+
+      expandToSize(capacity, exarray);
       data := Dangerous.arrayGetNoBoundsChecking(exarray.data, 1);
     end if;
 

testsuite/openmodelica/bootstrapping/ExpandableArrayTest.mos

@@ -85,7 +85,7 @@ ExpandableArrayTest.Test(); getErrorString();
 // set(2, 2) (1/2)
 // ========================================
 // 2: 2
-// add(1) (2/3)
+// add(1) (2/4)
 // ========================================
 // 2: 2
 // 3: 1
@@ -94,13 +94,13 @@ ExpandableArrayTest.Test(); getErrorString();
 // 2: 2
 // 3: 1
 // 4: 3
-// set(5, 6) (4/5)
+// set(5, 6) (4/8)
 // ========================================
 // 2: 2
 // 3: 1
 // 4: 3
 // 5: 6
-// update(5, 5) (4/5)
+// update(5, 5) (4/8)
 // ========================================
 // 2: 2
 // 3: 1
@@ -112,14 +112,14 @@ ExpandableArrayTest.Test(); getErrorString();
 // 2: 2
 // 3: 1
 // 4: 3
-// set(6, 6) (5/6)
+// set(6, 6) (5/8)
 // ========================================
 // 1: 5
 // 2: 2
 // 3: 1
 // 4: 3
 // 6: 6
-// clear() (0/6)
+// clear() (0/8)
 // ========================================
 // <empty>
 // shrink() (0/0)
@@ -128,10 +128,10 @@ ExpandableArrayTest.Test(); getErrorString();
 // shrink() (0/0)
 // ========================================
 // <empty>
-// set(7, 1) (1/7)
+// set(7, 1) (1/8)
 // ========================================
 // 7: 1
-// delete(7) (0/7)
+// delete(7) (0/8)
 // ========================================
 // <empty>
 // shrink() (0/0)