Fix repeat block iteration count not being optimizable in yielding loops

Author: GarboMuffin

src/compiler/iroptimizer.js

@@ -650,16 +650,19 @@ class IROptimizer {
      * @private
      */
     analyzeLoopedStack (stack, state, block, willReevaluateInputs) {
+        let modified = false;
+
         if (block.yields && !this.ignoreYields) {
-            let modified = state.clear();
+            modified = state.clear();
+            if (willReevaluateInputs) {
+                modified = this.analyzeInputs(block.inputs, state) || modified;
+            }
             block.entryState = state.clone();
             block.exitState = state.clone();
-            modified = this.analyzeInputs(block.inputs, state) || modified;
             return this.analyzeStack(stack, state) || modified;
         }
 
         let iterations = 0;
-        let modified = false;
         let keepLooping;
         do {
             // If we are stuck in an apparent infinite loop, give up and assume the worst.

test/snapshot/__snapshots__/warp-timer/tw-repeat-analysis-doesnt-reanalyze.sb3.tw-snapshot

@@ -21,7 +21,7 @@ const b0 = stage.variables["`jEk@4|i[#Fk?(8x)AV.-my variable"];
 const b1 = stage.variables["6h7bpiz0`;;x^G1B3(%["];
 return function* genXYZ_a () {
 b0.value = b1.value.length;
-for (var a0 = (+b0.value || 0); a0 >= 0.5; a0--) {
+for (var a0 = b0.value; a0 > 0; a0--) {
 b0.value = "bwah";
 if (isStuck()) yield;
 }