proc_macro: Tweak doc comments and negative literals
This commit tweaks the tokenization of a doc comment to use `#[doc = "..."]` like `macro_rules!` does (instead of treating it as a `Literal` token). Additionally it fixes treatment of negative literals in the compiler, for exapmle `Literal::i32(-1)`. The current fix is a bit of a hack around the current compiler implementation, providing a fix at the proc-macro layer rather than the libsyntax layer.
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