[PATCH] D121420: [lld][WebAssembly] Take advantage of extended const expression when available

[Sam Clegg via Phabricator via llvm-commits]

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In particular, when extended-const is available and we building PIC
code we no longer need to combine output segments into a single segment
that can be initialized at `__memory_base`.  Instead each segment
can encode its offset from `__memory_base` in its initializer.  e.g.

  (i32.add (global.get __memory_base) (i32.const offset)


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D121420

Files:
  lld/test/wasm/tls-non-shared-memory.s
  lld/wasm/Config.h
  lld/wasm/OutputSections.cpp
  lld/wasm/Writer.cpp

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