Deferred diagnostics are broken for In-class initializers

[Fznamznon]

The following test case cannot be diagnosed with deferred diagnostics system:

int foo() { throw 1; }
struct S {
    int bar = foo();
};
SYCL_EXTERNAL void bar() { S s; }

We do our reporting at a functiondecl->caller level, when the declcontext can actually be a CXXRecordDecl as well.
NOTE: This seems broken not only for SYCL, but for any other programming model which allows in-class initializes.

[github-actions]

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[Fznamznon]

The issue is still here.