[Rd] Crash/bug when calling match on latin1 strings

[Travers Ching]

Here's a brief example:

# A bunch of words in UTF8; replace *'s
words <- readLines("h****://pastebin.c**/raw/MFCQfhpY", encoding = "UTF-8")
words2 <- iconv(words, "utf-8", "latin1")
gctorture(TRUE)
y <- match(words2, words2)
<The program crashes / segfaults ~90% of the time>

I searched bugzilla but didn't see anything. Apologies if this is already
reported.

The bug appears in both R-devel and the release, but doesn't seem to affect
R 4.0.5.

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