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Commit eca1e031 authored by Duncan P. N. Exon Smith's avatar Duncan P. N. Exon Smith
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Bitcode: Use unsigned char to record MDStrings 

`MDString`s can have arbitrary characters in them.  Prevent an assertion
that fired in `BitcodeWriter` because of sign extension by copying the
characters into the record as `unsigned char`s.

Based on a patch by Keno Fischer; fixes PR21882.

llvm-svn: 224077
parent c694ac55
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