[wasm] Remove non-standard kExprI8Const bytecode

src/asmjs/asm-wasm-builder.cc

Index: src/asmjs/asm-wasm-builder.cc
diff --git a/src/asmjs/asm-wasm-builder.cc b/src/asmjs/asm-wasm-builder.cc
index 4996203ce2bba91cb888cb44c2a59f14b38e9b59..91d4a7023bb09d40483fa1ccdefddd5b92d36fac 100644
--- a/src/asmjs/asm-wasm-builder.cc
+++ b/src/asmjs/asm-wasm-builder.cc
@@ -1092,7 +1092,7 @@ class AsmWasmBuilderImpl final : public AstVisitor<AsmWasmBuilderImpl> {
       // Mask bottom bits to match asm.js behavior.
       byte mask = static_cast<byte>(~(size - 1));
       RECURSE(Visit(binop->left()));
-      current_function_builder_->EmitWithU8(kExprI8Const, mask);
+      current_function_builder_->EmitI32Const(mask);
       current_function_builder_->Emit(kExprI32And);
       return;
     }
@@ -1231,7 +1231,7 @@ class AsmWasmBuilderImpl final : public AstVisitor<AsmWasmBuilderImpl> {
           // if set_local(tmp, x) < 0
           Visit(call->arguments()->at(0));
           current_function_builder_->EmitTeeLocal(tmp.index());
-          byte code[] = {WASM_I8(0)};
+          byte code[] = {WASM_ZERO};
           current_function_builder_->EmitCode(code, sizeof(code));
           current_function_builder_->Emit(kExprI32LtS);
           current_function_builder_->EmitWithU8(kExprIf, kLocalI32);