[PATCH] D40698: [ubsan] Diagnose reached-unreachable after noreturn calls

[Vedant Kumar via Phabricator via cfe-commits]

vsk created this revision.

It's possible to reach an 'unreachable' instruction if a call to a
noreturn function returns. Diagnose this behavior.

Note: Most of the changes in this patch -- passing empty SourceLocations
in places where they are either not needed or do not apply -- are NFC.

Testing: check-clang, check-ubsan, check-ubsan-minimal

rdar://33660464


https://reviews.llvm.org/D40698

Files:
  lib/CodeGen/CGAtomic.cpp
  lib/CodeGen/CGBlocks.cpp
  lib/CodeGen/CGBuiltin.cpp
  lib/CodeGen/CGCall.cpp
  lib/CodeGen/CGClass.cpp
  lib/CodeGen/CGDecl.cpp
  lib/CodeGen/CGException.cpp
  lib/CodeGen/CGExpr.cpp
  lib/CodeGen/CGExprCXX.cpp
  lib/CodeGen/CGExprComplex.cpp
  lib/CodeGen/CGObjC.cpp
  lib/CodeGen/CGObjCGNU.cpp
  lib/CodeGen/CGObjCMac.cpp
  lib/CodeGen/CGVTables.cpp
  lib/CodeGen/CodeGenFunction.h
  lib/CodeGen/MicrosoftCXXABI.cpp
  test/CodeGenCXX/ubsan-unreachable.cpp

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