Alex Lorenz 5ff6b8655a [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

llvm-svn: 307384

2017-07-07 10:25:12 +00:00

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