[DebugInfo] [SILSROA] Fix variable scope in some cases

SILBuilderWithScope ignores the scope of the debug value and uses the
scope of the next real instruction. We want to preserve the scope
of the original debug value, so we pass it explicitly.

(cherry picked from commit fac61c5)

Author: Snowy1803

lib/SILOptimizer/Transforms/SILSROA.cpp

@@ -298,7 +298,7 @@ void SROAMemoryUseAnalyzer::chopUpAlloca(std::vector<AllocStackInst *> &Worklist
     SILInstruction *User = Operand->getUser();
     auto *DVI = dyn_cast<DebugValueInst>(User);
     assert(DVI && "getDebugUses should only return DebugValueInst");
-    SILBuilderWithScope B(DVI);
+    SILBuilder B(DVI, DVI->getDebugScope());
     std::optional<SILDebugVariable> DVIVarInfo = DVI->getVarInfo();
     assert(DVIVarInfo && "debug_value without debug info");