[WebAssembly] Misc. cosmetic changes in EH (NFC)

- Rename `wasm.catch` intrinsic to `wasm.catch.exn`, because we are
  planning to add a separate `wasm.catch.longjmp` intrinsic which
  returns two values.
- Rename several variables
- Remove an unnecessary parameter from `canLongjmp` and `isEmAsmCall`
  from LowerEmscriptenEHSjLj pass
- Add `-verify-machineinstrs` in a test for a safety measure
- Add more comments + fix some errors in comments
- Replace `std::vector` with `SmallVector` for cases likely with small
  number of elements
- Renamed `EnableEH`/`EnableSjLj` to `EnableEmEH`/`EnableEmSjLj`: We are
  soon going to add `EnableWasmSjLj`, so this makes the distincion
  clearer

Reviewed By: tlively

Differential Revision: https://reviews.llvm.org/D107405

1 files changed, 4 insertions, 3 deletions

diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyMCInstLower.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyMCInstLower.cpp
index ec2380a..2f874bb 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyMCInstLower.cpp
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyMCInstLower.cpp
@@ -38,8 +38,8 @@ cl::opt<bool>
                                " instruction output for test purposes only."),
                       cl::init(false));
 
-extern cl::opt<bool> EnableEmException;
-extern cl::opt<bool> EnableEmSjLj;
+extern cl::opt<bool> WasmEnableEmException;
+extern cl::opt<bool> WasmEnableEmSjLj;
 
 static void removeRegisterOperands(const MachineInstr *MI, MCInst &OutMI);
 
@@ -82,7 +82,8 @@ WebAssemblyMCInstLower::GetGlobalAddressSymbol(const MachineOperand &MO) const {
 
   bool InvokeDetected = false;
   auto *WasmSym = Printer.getMCSymbolForFunction(
-      F, EnableEmException || EnableEmSjLj, Signature.get(), InvokeDetected);
+      F, WasmEnableEmException || WasmEnableEmSjLj, Signature.get(),
+      InvokeDetected);
   WasmSym->setSignature(Signature.get());
   Printer.addSignature(std::move(Signature));
   WasmSym->setType(wasm::WASM_SYMBOL_TYPE_FUNCTION);