r185397 - [APFloat] Ensure that we can properly parse strings that do not have null terminators.

[Jordan Rose]

Just looking at this now: shouldn't the end-of-string check come before we try to read the character? 

+  if (decDigitValue(*D.firstSigDigit) >= 10U || D.firstSigDigit == str.end()) {

If the string is on the end of a page, this could still crash.

Jordan
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