[PATCH] D148054: [WebAssembly] `AsmTypeCheck` support to br instr

[Congcong Cai via Phabricator via llvm-commits]

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This PR introduces the `BrStack` member to store the info about
`loop`, `block`, `if` and `try`. It can check whether `br` immediate number
out of range.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D148054

Files:
  llvm/lib/Target/WebAssembly/AsmParser/WebAssemblyAsmTypeCheck.cpp
  llvm/lib/Target/WebAssembly/AsmParser/WebAssemblyAsmTypeCheck.h
  llvm/test/MC/WebAssembly/type-checker-errors.s

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