[WinEH] Fix issue of dynamic alloca in try block

[pengfei]

Tested this with cases in #60914. Both got segmentation fault. I think this should not be a correct fix.

llvm/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp

 //===-- FunctionLoweringInfo.cpp ------------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
if (isFuncletEHPersonality(Personality)) {
     else if (isAsynchronousEHPersonality(Personality))
       calculateSEHStateNumbers(&fn, EHInfo);
     else if (Personality == EHPersonality::CoreCLR)
       calculateClrEHStateNumbers(&fn, EHInfo);
 
     // Map all BB references in the WinEH data to MBBs.
     for (WinEHTryBlockMapEntry &TBME : EHInfo.TryBlockMap) {
       for (WinEHHandlerType &H : TBME.HandlerArray) {
-        if (const AllocaInst *AI = H.CatchObj.Alloca)
+        const AllocaInst *AI = H.CatchObj.Alloca;
+        if (AI && AI->isStaticAlloca())
           CatchObjects.insert({AI, {}}).first->second.push_back(
               &H.CatchObj.FrameIndex);
         else
           H.CatchObj.FrameIndex = INT_MAX;
       }
     }
   }
 

llvm/test/CodeGen/X86/wineh-dyn-alloca.ll

+; RUN: llc -mtriple=x86_64-pc-windows-msvc19 -verify-machineinstrs < %s | FileCheck %s
+
+%struct.widget = type { ptr, ptr, [8 x i8] }
+
+@global = external global %struct.widget
+
+define dso_local void @hoist() local_unnamed_addr #0 personality ptr @__CxxFrameHandler3 {
+bb:
+  br i1 poison, label %bb1, label %bb7
+
+; CHECK:.Ltmp0:
+; CHECK:  subq  $32, %rsp
+; CHECK:  callq snork
+; CHECK:  addq  $32, %rsp
+bb1:                                              ; preds = %bb
+  %tmp = alloca i32, align 4
+  invoke void @snork()
+          to label %bb6 unwind label %bb2
+
+bb2:                                              ; preds = %bb1
+  %tmp3 = catchswitch within none [label %bb4] unwind label %bb8
+
+bb4:                                              ; preds = %bb2
+  %tmp5 = catchpad within %tmp3 [ptr @global, i32 0, ptr %tmp]
+  unreachable
+
+bb6:                                              ; preds = %bb1
+  unreachable
+
+bb7:                                              ; preds = %bb
+  ret void
+
+bb8:                                              ; preds = %bb2
+  %tmp9 = cleanuppad within none []
+  unreachable
+}
+
+declare dso_local i32 @__CxxFrameHandler3(...) #0
+
+declare dso_local void @snork() local_unnamed_addr #0
+
+attributes #0 = { nofree }