Add size asserts for MIR SourceScopeData & VarDebugInfo

There's vectors of both of these in `mir::Body`, so might as well track them.

Author: scottmcm

compiler/rustc_middle/src/mir/mod.rs

@@ -3096,9 +3096,11 @@ mod size_asserts {
     // tidy-alphabetical-start
     static_assert_size!(BasicBlockData<'_>, 144);
     static_assert_size!(LocalDecl<'_>, 40);
+    static_assert_size!(SourceScopeData<'_>, 72);
     static_assert_size!(Statement<'_>, 32);
     static_assert_size!(StatementKind<'_>, 16);
     static_assert_size!(Terminator<'_>, 112);
     static_assert_size!(TerminatorKind<'_>, 96);
+    static_assert_size!(VarDebugInfo<'_>, 80);
     // tidy-alphabetical-end
 }