Very long command line leads to an invalid eventlog

Reproduce with:

echo "module A100 where" > A100.hs
echo -optP-D__F{1..10000}__ > T14697-flags
ghc --make A100 $(cat T14697-flags) +RTS -l

Produces an eventlog which ghc-events fails to parse.

[nix-shell:~/eventlog2html]$ cabal run eventlog2html -- ghc.eventlog 
eventlog2html: Ix{Int}.index: Index (24415) out of range ((0,212))

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