[asm.js] (Re)use temporaries in asm->wasm conversion.

src/wasm/encoder.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/signature.h"
 
 #include "src/handles.h"
 #include "src/v8.h"
 #include "src/zone-containers.h"
 
@@ skipping 38 matching lines @@
   buffer.patch_u32v(start, static_cast<uint32_t>(buffer.offset() - start -
                                                  kPaddedVarInt32Size));
 }
 
 WasmFunctionBuilder::WasmFunctionBuilder(WasmModuleBuilder* builder)
     : builder_(builder),
       locals_(builder->zone()),
       signature_index_(0),
       exported_(0),
       body_(builder->zone()),
-      name_(builder->zone()) {}
+      name_(builder->zone()),
+      i32_temps_(builder->zone()),
+      i64_temps_(builder->zone()),
+      f32_temps_(builder->zone()),
+      f64_temps_(builder->zone()) {}
 
 void WasmFunctionBuilder::EmitVarInt(uint32_t val) {
   byte buffer[8];
   byte* ptr = buffer;
   LEBHelper::write_u32v(&ptr, val);
   for (byte* p = buffer; p < ptr; p++) {
     body_.push_back(*p);
   }
 }
 
@@ skipping 303 matching lines @@
 
     for (auto segment : data_segments_) {
       segment->Write(buffer);
     }
     FixupSection(buffer, start);
   }
 }
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8