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Replace TableGen range piece punctuator with '...'

Authored by Paul-C-Anagnostopoulos on Aug 21 2020, 2:22 PM.

Description

Replace TableGen range piece punctuator with '...'

The TableGen range piece punctuator is currently '-' (e.g., {0-9}),
which interacts oddly with the fact that an integer literal's sign
is part of the literal. This patch replaces the '-' with the new
punctuator '...'. The '-' punctuator is deprecated.

Differential Revision: https://reviews.llvm.org/D85585

Change-Id: I3d53d14e23f878b142d8f84590dd465a0fb6c09c