[WebAssembly] Clean up several FIXME comments.

llvm-svn: 254079
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyInstrMemory.td b/llvm/lib/Target/WebAssembly/WebAssemblyInstrMemory.td
index 3b6c6cb9..f0cc02a 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyInstrMemory.td
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyInstrMemory.td
@@ -12,7 +12,7 @@
 ///
 //===----------------------------------------------------------------------===//
 
-// FIXME:
+// TODO:
 //  - HasAddr64
 //  - WebAssemblyTargetLowering::isLegalAddressingMode
 //  - WebAssemblyTargetLowering having to do with atomics