Test internal2 #7
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All deserialized VarDecl initializers are EvaluatedStmt, but not all EvaluatedStmt initializers are from a PCH. Calling `VarDecl::hasInitWithSideEffects` can trigger constant evaluation, but it's hard to know ahead of time whether that will trigger deserialization - even if the initializer is fully deserialized, it may contain a call to a constructor whose body is not deserialized. By caching the result of `VarDecl::hasInitWithSideEffects` and populating that cache during deserialization we can guarantee that calling it won't trigger deserialization regardless of the state of the initializer. This also reduces memory usage by removing the `InitSideEffectVars` set in `ASTReader`. rdar://154717930
EvaluateAsInitializer does not support evaluating values with dependent types. This was previously guarded with a check for the initializer expression, but it is possible for the VarDecl to have a dependent type without the initializer having a dependent type, when the initializer is a specialized template type and the VarDecl has the unspecialized type. This adds a guard checking for dependence in the VarDecl type as well. This fixes the issue raised by Google in llvm#145447
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