[PATCH] D96595: [WebAssemblly] Fix rethrow's argument computation

[Heejin Ahn via Phabricator via llvm-commits]

aheejin created this revision.
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Previously we assumed `rethrow`'s argument was always 0, but it turned
out `rethrow` follows the same rule with `br` or `delegate`:
https://github.com/WebAssembly/exception-handling/pull/137
https://github.com/WebAssembly/exception-handling/issues/146#issuecomment-777349038

Currently `rethrow`s generated by our backend always rethrow the
exception caught by the innermost enclosing catch, so this adds a
function to compute that and replaces `rethrow`'s argument with its
computed result.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D96595

Files:
  llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyInstPrinter.cpp
  llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyInstPrinter.h
  llvm/lib/Target/WebAssembly/WebAssemblyCFGStackify.cpp
  llvm/lib/Target/WebAssembly/WebAssemblyInstrControl.td
  llvm/test/CodeGen/WebAssembly/cfg-stackify-eh.ll
  llvm/test/CodeGen/WebAssembly/exception.mir

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