Reduce bucket count and range for wasm function count, and add "module" to some names.

src/wasm/module-decoder.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/wasm/module-decoder.h"
 
 #include "src/base/functional.h"
 #include "src/base/platform/platform.h"
 #include "src/macro-assembler.h"
 #include "src/objects.h"
@@ skipping 762 matching lines @@
   size_t size = module_end - module_start;
   if (module_start > module_end) return ModuleError("start > end");
   if (size >= kMaxModuleSize) return ModuleError("size > maximum module size");
   // TODO(bradnelson): Improve histogram handling of size_t.
   isolate->counters()->wasm_module_size_bytes()->AddSample(
       static_cast<int>(size));
   WasmModule* module = new WasmModule();
   ModuleDecoder decoder(zone, module_start, module_end, origin);
   ModuleResult result = decoder.DecodeModule(module, verify_functions);
   // TODO(bradnelson): Improve histogram handling of size_t.
-  isolate->counters()->wasm_decode_peak_memory_bytes()->AddSample(
+  isolate->counters()->wasm_decode_module_peak_memory_bytes()->AddSample(
       static_cast<int>(zone->allocation_size() - decode_memory_start));
   return result;
 }
 
 FunctionSig* DecodeWasmSignatureForTesting(Zone* zone, const byte* start,
                                            const byte* end) {
   ModuleDecoder decoder(zone, start, end, kWasmOrigin);
   return decoder.DecodeFunctionSignature(start);
 }
 
@@ skipping 10 matching lines @@
     return FunctionError("size > maximum function size");
   isolate->counters()->wasm_function_size_bytes()->AddSample(
       static_cast<int>(size));
   WasmFunction* function = new WasmFunction();
   ModuleDecoder decoder(zone, function_start, function_end, kWasmOrigin);
   return decoder.DecodeSingleFunction(module_env, function);
 }
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8