[WebAssembly] Renumber and LEB128-encode SIMD opcodes

Reviewers: aheejin, dschuff, aardappel

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

Differential Revision: https://reviews.llvm.org/D54126

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@346463 91177308-0d34-0410-b5e6-96231b3b80d8

Author: tlively

lib/Target/WebAssembly/MCTargetDesc/WebAssemblyMCCodeEmitter.cpp

@@ -67,7 +67,8 @@ void WebAssemblyMCCodeEmitter::encodeInstruction(
     OS << uint8_t(Binary);
   } else {
     assert(Binary <= UINT16_MAX && "Several-byte opcodes not supported yet");
-    OS << uint8_t(Binary >> 8) << uint8_t(Binary);
+    OS << uint8_t(Binary >> 8);
+    encodeULEB128(uint8_t(Binary), OS);
   }
 
   // For br_table instructions, encode the size of the table. In the MCInst,