revset: restore parsing rule for expression without "modifier:" syntax 69c36fe1 parent e0a3ceb3

The new parse_program() will allow us to parse top-level string patterns with no parentheses. This patch also replaces a few callers of the old parse_program(). When we drop support for the all: modifier syntax, parse_program_with_modifier() will be replaced entirely.

authored by Yuya Nishihara