[Frontend] Verify that the bitstream is not empty before reading
the serialised diagnostics
Clang should avoid calling report_fatal_error when the file with the serialised
diagnostics is empty. This commit changes Clang's serialised diagnostic reader,
now it reports an appropriate error instead of crashing.
rdar://31939877
Differential Revision: https://reviews.llvm.org/D35069
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@307384 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit a43da8254fec1e97522a57b74b7a8f8bb04d827c)
3 files changed
