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[Modules] Do not emit relocation error when -fno-validate-pch is set

Description

[Modules] Do not emit relocation error when -fno-validate-pch is set

Summary:
Clang emits error when implicit modules was relocated from the
first build directory. However this was biting our usecase where we copy
the contents of build directory to another directory in order to
distribute.

Differential Revision: https://reviews.llvm.org/D49852