[PATCH] D136110: [wasm-ld] Define a `__heap_end` symbol marking the end of allocated memory.

[Dan Gohman via Phabricator via llvm-commits]

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Define a `__heap_end` symbol that marks the end of the memory region
that starts at `__heap_base`. This will allow malloc implementations to
know how much memory they can use at `__heap_base` even if someone has
done a `memory.grow` before they can initialize their state.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D136110

Files:
  lld/test/wasm/export-all.s
  lld/test/wasm/mutable-global-exports.s
  lld/wasm/Driver.cpp
  lld/wasm/Symbols.cpp
  lld/wasm/Symbols.h
  lld/wasm/Writer.cpp

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