Chris Lattner b692bed732 emit a specific error when the input file is empty. This fixes ...

an annoyance of mine when working on tests: if the input .ll file
is broken, opt outputs an error and generates an empty file.  FileCheck
then emits its "ooh I couldn't find the first CHECK line, scanning
from ..." which obfuscates the actual problem.

llvm-svn: 125193

2011-02-09 16:46:02 +00:00

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