Remove method that always returns true.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@191533 91177308-0d34-0410-b5e6-96231b3b80d8
Quick-fix the test for no-asserts build

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@191534 91177308-0d34-0410-b5e6-96231b3b80d8
SourceManager: Open code isInMainFile.

- We really shouldn't compute line numbers for every file that is asked if it's
  the main file, it destroys the lazy computation.
- Invalid locations are no longer accounted to the main file, no other
  functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@191535 91177308-0d34-0410-b5e6-96231b3b80d8
Adding pre/post conditions for some Replacement handling functions

The vector version of shiftedCodePosition() requires Replacements to be
in sorted order.

Turned existing comment about sorting for deduplicate() into an exact
post condition.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@191536 91177308-0d34-0410-b5e6-96231b3b80d8
clang-cl: pass /FI options to fallback

We started parsing /FI in r191442, and now we can pass it on to the
fallback too.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@191537 91177308-0d34-0410-b5e6-96231b3b80d8