WebAssembly: basic instructions todo, and basic register info.

Summary:
This code is based on AArch64 for modern backend good practice, and NVPTX for
virtual ISA concerns.

Reviewers: sunfish

Subscribers: aemerson, llvm-commits, jfb

Differential Revision: http://reviews.llvm.org/D11070

llvm-svn: 241923
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyInstrSIMD.td b/llvm/lib/Target/WebAssembly/WebAssemblyInstrSIMD.td
index e25483a..3e29906 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyInstrSIMD.td
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyInstrSIMD.td
@@ -6,9 +6,10 @@
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
-//
-// WebAssembly SIMD operand code-gen constructs.
-//
+///
+/// \file
+/// \brief WebAssembly SIMD operand code-gen constructs.
+///
 //===----------------------------------------------------------------------===//
 
 // TODO: Implement SIMD instructions.