[PATCH] D130481: [RISCV] Add the GlobalMerge pass (disabled by default)

[Alex Bradbury via Phabricator via llvm-commits]

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Split out from D129178 <https://reviews.llvm.org/D129178>, this just adds the GlobalMerge tests (other than global-merge-minsize.ll which is testing a specific configuration of the pass when it's enabled) and exposes `-riscv-enable-global-merge` and //doesn't enable it by default//.

Note that the comment "// FIXME: Unify control over GlobalMerge." is copied from the Arm and AArch64 backends, which expose the same flag. Presumably the author is imagining some later refactoring that provides a target-independent flag.


https://reviews.llvm.org/D130481

Files:
  llvm/lib/Target/RISCV/RISCVTargetMachine.cpp
  llvm/test/CodeGen/RISCV/global-merge-offset.ll
  llvm/test/CodeGen/RISCV/global-merge.ll

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