[torque] Add negative decimal literals.
This CL changes the DECIMAL_LITERAL lexer rule to allow negative decimal literals as well. This could also be achieved by using the unary minus operation, which would occur an runtime overhead and feel counter-intuitive for literals (imho). R=tebbi@chromium.org Change-Id: Ib01aa1930254bcd85a161de385b0fd4f176feb46 Reviewed-on: https://chromium-review.googlesource.com/1027473Reviewed-by: Daniel Clifford <danno@chromium.org> Commit-Queue: Simon Zünd <szuend@google.com> Cr-Commit-Position: refs/heads/master@{#52773}
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