Prepare basic GlobalISel setup and implement CallLowering::lowerFormalArguments and CallLowering::lowerReturn

Author: QuantumSegfault

llvm/lib/Target/WebAssembly/CMakeLists.txt

@@ -15,6 +15,10 @@ tablegen(LLVM WebAssemblyGenSubtargetInfo.inc -gen-subtarget)
 add_public_tablegen_target(WebAssemblyCommonTableGen)
 
 add_llvm_target(WebAssemblyCodeGen
+  GISel/WebAssemblyCallLowering.cpp
+  GISel/WebAssemblyInstructionSelector.cpp
+  GISel/WebAssemblyRegisterBankInfo.cpp
+  GISel/WebAssemblyLegalizerInfo.cpp
   WebAssemblyAddMissingPrototypes.cpp
   WebAssemblyArgumentMove.cpp
   WebAssemblyAsmPrinter.cpp