Fix repeat-until scoping bug in VMify compiler

Co-authored-by: levno-710 <62939318+levno-710@users.noreply.github.com>

Author: Copilot

src/prometheus/compiler/compiler.lua

@@ -1553,12 +1553,10 @@ function Compiler:compileStatement(statement, funcDepth)
         local innerBlock = self:createBlock();
         local finalBlock = self:createBlock();
         local checkBlock = self:createBlock();
-        statement.__start_block = checkBlock;
+        statement.__start_block = innerBlock;
         statement.__final_block = finalBlock;
 
-        local conditionReg = self:compileExpression(statement.condition, funcDepth, 1)[1];
         self:addStatement(self:setRegister(scope, self.POS_REGISTER, Ast.NumberExpression(innerBlock.id)), {self.POS_REGISTER}, {}, false);
-        self:freeRegister(conditionReg, false);
 
         self:setActiveBlock(innerBlock);
         self:compileBlock(statement.body, funcDepth);