[WebAssembly] Rename except_ref type to exnref

Summary:
We agreed to rename `except_ref` to `exnref` for consistency with other
reference types in
https://github.com/WebAssembly/exception-handling/issues/79. This also
renames WebAssemblyInstrExceptRef.td to WebAssemblyInstrRef.td in order
to use the file for other reference types in future.

Reviewers: dschuff

Subscribers: sbc100, jgravelle-google, hiraditya, sunfish, jfb, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D64703

llvm-svn: 366145
diff --git a/llvm/lib/Target/WebAssembly/AsmParser/WebAssemblyAsmParser.cpp b/llvm/lib/Target/WebAssembly/AsmParser/WebAssemblyAsmParser.cpp
index e9a7f69..09628e8 100644
--- a/llvm/lib/Target/WebAssembly/AsmParser/WebAssemblyAsmParser.cpp
+++ b/llvm/lib/Target/WebAssembly/AsmParser/WebAssemblyAsmParser.cpp
@@ -308,8 +308,8 @@
         Type == "i32x4" || Type == "i64x2" || Type == "f32x4" ||
         Type == "f64x2")
       return wasm::ValType::V128;
-    if (Type == "except_ref")
-      return wasm::ValType::EXCEPT_REF;
+    if (Type == "exnref")
+      return wasm::ValType::EXNREF;
     return Optional<wasm::ValType>();
   }
 
@@ -320,7 +320,7 @@
         .Case("f32", WebAssembly::ExprType::F32)
         .Case("f64", WebAssembly::ExprType::F64)
         .Case("v128", WebAssembly::ExprType::V128)
-        .Case("except_ref", WebAssembly::ExprType::ExceptRef)
+        .Case("exnref", WebAssembly::ExprType::Exnref)
         .Case("void", WebAssembly::ExprType::Void)
         .Default(WebAssembly::ExprType::Invalid);
   }