[ms] [llvm-ml] Implement the expression expansion operator

[epastor]

Summary

In text-item contexts, %expr expands to a string containing the results of evaluating expr.

[epastor]

Fix missing brackets around a case block

[epastor]

Removed debug line

[thakis]

The diff looks like maybe there was a rebasing accident (?)

llvm/lib/MC/MCParser/MasmParser.cpp

3302

This branch seems unrelated to this patch (?)

5541

also looks unrelated (?)

6018

llvm code style says no else after return; lhs code was better

[epastor]

Rebase on HEAD

[thakis]

llvm/lib/MC/MCParser/MasmParser.cpp

3216–3217

Was the patch that added this already landed? If not, maybe remove it there instead of here :)

6018

(this is still not addressed)

[epastor]

Rebase on parent (pushed a change further up the stack)

[epastor]

Remove "return/else" branches to match LLVM style

[epastor]

llvm/lib/MC/MCParser/MasmParser.cpp

3302

This is part of unifying handling for all textitem forms, including textmacros.

5541

This fixes an unrelated bug discovered in the course of testing this commit - before, there was no error for a failure to parse the textitem.

6018

Addressed now; thanks!