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

src/wasm/module-decoder.cc

Index: src/wasm/module-decoder.cc
diff --git a/src/wasm/module-decoder.cc b/src/wasm/module-decoder.cc
index 0189b2af524febbb2397e79442cc0057332b1bfb..f09e4ea77b2ebe1d6384c9b23ab9ee4b64338553 100644
--- a/src/wasm/module-decoder.cc
+++ b/src/wasm/module-decoder.cc
@@ -780,7 +780,7 @@ ModuleResult DecodeWasmModule(Isolate* isolate, Zone* zone,
   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;
 }