Changes

Reland "[AsmParser] make .ascii support spaces as separators"

This relands commit e0963ae274be5b071d1e1b00f5e4e019483c09e9, which was
reverted on commit 82c4153e66fa284729da86a8d6c302d4b8cec86c due to a
test failure, which turned out to be a false positive.