[MS-ABI]V-base dtor called more than needed when throw happens in v-base ctor in...

[MS-ABI]V-base dtor called more than needed when throw happens in v-base ctor in window. Need add "complete object flag" check in eh cleanup code.

The problem only happen on window ( A MS-ABI issuer )

The nature of the problem is virtual base dtor called more than it is needed after exception throw in inheriting base class(with virtual bases) ctor.

The root problem is when throw happen, not all virtual base classes have been contructed, so not all virtual base dtors are need to call for ehcleanup.

clang has code to handle vbase initialization: basically add check for "complete object flag" before call to v-base ctor.
But that part is missing for cleanup code.

To fix this add similar code as v-base init to cleanup code, same algorithm.

1> Add new routine:
EmitDtorCompleteObjectHandler

With corresponding to EmitCtorCompleteObjectHandler

2> In the EmitDestructorCal
Call EmitDtorCompleteObjectHandler when generate ehcleanup inside ctor.

Just add check for "complete object flag" before call to v-base dtor.

Without my change:
ehcleanup: ; preds = %ctor.skip_vbases

%13 = cleanuppad within none [], !dbg !66
%14 = bitcast %struct.class_0* %this1 to i8*, !dbg !66
%15 = getelementptr inbounds i8, i8* %14, i64 8, !dbg !66
%16 = bitcast i8* %15 to %struct.class_2*, !dbg !66
call void @"\01??1class_2@@UEAA@XZ"(%struct.class_2* %16) #6 [ "funclet"(token

%13) ], !dbg !66

cleanupret from %13 unwind to caller, !dbg !66

with my change:
ehcleanup: ; preds = %ctor.skip_vbases

%13 = cleanuppad within none [], !dbg !66
%14 = bitcast %struct.class_0* %this1 to i8*, !dbg !66
%15 = getelementptr inbounds i8, i8* %14, i64 8, !dbg !66
%16 = bitcast i8* %15 to %struct.class_2*, !dbg !66
%is_complete_object4 = icmp ne i32 %is_most_derived2, 0, !dbg !66
br i1 %is_complete_object4, label %Dtor.dtor_vbase, label %Dtor.skip_vbase, !d

bg !66

Dtor.dtor_vbase: ; preds = %ehcleanup

call void @"\01??1class_2@@UEAA@XZ"(%struct.class_2* %16) #6 [ "funclet"(token

%13) ], !dbg !66

br label %Dtor.skip_vbase, !dbg !66

Dtor.skip_vbase: ; preds = %Dtor.dtor_vbase, %ehcleanup

cleanupret from %13 unwind to caller, !dbg !66

Please let me know you need more info.

Patch by Jennifer Yu.

Differential Revision: https://reviews.llvm.org/D27358

llvm-svn: 288869