[vm/fuzzer] disable control flow collections again

Rationale:
I need a bit more time to investigate the failures.
No need to have massive amounts of divergences in
our nightly in the meantime.

dart-lang#38231

Change-Id: I2fee0ba36292a2a38fce1d9a4727e5c4b74f0f1c
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/115842
Reviewed-by: Felicitas Hetzelt <felih@google.com>
Commit-Queue: Aart Bik <ajcbik@google.com>

runtime/tools/dartfuzz/dartfuzz.dart

@@ -14,7 +14,7 @@ import 'dartfuzz_ffiapi.dart';
 // Version of DartFuzz. Increase this each time changes are made
 // to preserve the property that a given version of DartFuzz yields
 // the same fuzzed program for a deterministic random seed.
-const String version = '1.37';
+const String version = '1.38';
 
 // Restriction on statements and expressions.
 const int stmtLength = 2;
@@ -768,7 +768,8 @@ class DartFuzz {
 
   void emitCollectionElement(int depth, DartType tp) {
     int r = depth <= exprDepth ? rand.nextInt(10) : 10;
-    switch (r) {
+    // TODO(ajcbik): renable, https://github.com/dart-lang/sdk/issues/38231
+    switch (r + 3) {
       // Favors elements over control-flow collections.
       case 0:
         emit('...'); // spread