Matthias Krüger fd445ddf96
Rollup merge of #92016 - calebcartwright:expose-asm-args-parsing, r=Amanieu
builtin_macros: allow external consumers for AsmArgs parsing

As discussed in Zulip (https://rust-lang.zulipchat.com/#narrow/stream/131828-t-compiler/topic/parsing.20of.20AsmArgs.20for.20inline.20assembly), we need a function entry point that rustfmt can leverage from a pre-expansion context to get a more structured representation of the asm args without having to duplicate/maintain the token stream parsing

r? ```@Amanieu``` and/or ```@joshtriplett```
2021-12-18 08:16:31 +01:00
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