[PCH] Fix a regression when PCH is used with -fmodules
Following up on r291465 after a regression in r276159. When we use
-fmodule-name=X while building a PCH, modular headers in X will be
textually included and the compiler knows that we are not building
module X, so don't serialize such headers in the PCH as being part of a
module, because at this point they are not.
This was causing subtle bugs and malformed AST crashes, for instance,
when using the PCH in subsequent compiler invocation with -fmodules, the
HFI for a modular header would map to the PCH, which would force a
module load of and unexistent module ID.
rdar://problem/30171164
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@294361 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit 93d08aa2190c39c455d39cd60f83bdd52bad71e1)
10 files changed
