Stephen Kelly 54272e5b66 NFC: Replace asserts with if() in SourceLocation accessors ...

Summary:
Nowhere else in the AST classes assert on these kinds of accessors.

This way, we can call the accessors and check the validity of the result
instead of externally duplicating the conditions.  This generality will
make it possible to introspect instances for source locations:

 http://ec2-18-191-7-3.us-east-2.compute.amazonaws.com:10240/z/iiaWhw

Reviewers: aaron.ballman

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D56354

llvm-svn: 350573

2019-01-07 21:57:30 +00:00

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