[PATCH] D12691: [WebAssembly] Support running without a register allocator in the default CodeGen passes

[Dan Gohman via llvm-commits]

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WebAssembly doesn't currently use a register allocator, but it does need PHI lowering and other passes. This pass adds support to the default TargetPassConfig::addFastRegAlloc and TargetPassConfig::addOptimizedRegAlloc for detecting when a target has requested no register allocation pass. 

This allows the removal of WebAssembly's custom implementations of addFastRegAlloc and addOptimizedRegAlloc.

Repository:
  rL LLVM

http://reviews.llvm.org/D12691

Files:
  lib/CodeGen/Passes.cpp
  lib/Target/WebAssembly/WebAssemblyTargetMachine.cpp

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