[WebAssembly] Remove the output operand from stores.

Per spec changes, store instructions in WebAssembly no longer have a return
value. Update the instruction descriptions.

Differential Revision: https://reviews.llvm.org/D25122

llvm-svn: 283501
diff --git a/llvm/test/CodeGen/WebAssembly/inline-asm.ll b/llvm/test/CodeGen/WebAssembly/inline-asm.ll
index d36c32b..9b72eb6 100644
--- a/llvm/test/CodeGen/WebAssembly/inline-asm.ll
+++ b/llvm/test/CodeGen/WebAssembly/inline-asm.ll
@@ -59,7 +59,7 @@
 
 ; CHECK-LABEL: X_i16:
 ; CHECK: foo $1{{$}}
-; CHECK: i32.store16 $drop=, 0($0), $1{{$}}
+; CHECK: i32.store16 0($0), $1{{$}}
 define void @X_i16(i16 * %t) {
   call void asm sideeffect "foo $0", "=*X,~{dirflag},~{fpsr},~{flags},~{memory}"(i16* %t)
   ret void
@@ -67,7 +67,7 @@
 
 ; CHECK-LABEL: X_ptr:
 ; CHECK: foo $1{{$}}
-; CHECK: i32.store $drop=, 0($0), $1{{$}}
+; CHECK: i32.store 0($0), $1{{$}}
 define void @X_ptr(i16 ** %t) {
   call void asm sideeffect "foo $0", "=*X,~{dirflag},~{fpsr},~{flags},~{memory}"(i16** %t)
   ret void