remove uses of folly::hash::fnv32_buf (#39509)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/39509

changelog: [internal]

Reviewed By: cipolleschi

Differential Revision: D49355595

fbshipit-source-id: a75fb91655a7252c4208415940cf9766f750a8ab

packages/react-native/Libraries/WebPerformance/PerformanceEntryReporter.cpp

@@ -10,6 +10,7 @@
 #include <react/renderer/core/EventLogger.h>
 #include "NativePerformanceObserver.h"
 
+#include <functional>
 #include <unordered_map>
 
 namespace facebook::react {
@@ -298,8 +299,7 @@ void PerformanceEntryReporter::scheduleFlushBuffer() {
 
 struct StrKey {
   uint32_t key;
-  StrKey(std::string_view s)
-      : key(folly::hash::fnv32_buf(s.data(), s.length())) {}
+  StrKey(std::string_view s) : key(std::hash<std::string_view>{}(s)) {}
 
   bool operator==(const StrKey& rhs) const {
     return key == rhs.key;

packages/react-native/ReactCommon/react/renderer/core/PropsMacros.h

@@ -8,6 +8,7 @@
 #pragma once
 
 #include <react/renderer/core/RawPropsPrimitives.h>
+#include <functional>
 
 // We need to use clang pragmas inside of a macro below,
 // so we need to pull out the "if" statement here.
@@ -26,7 +27,7 @@
     CLANG_PRAGMA("clang diagnostic pop")                  \
   }())
 
-#define RAW_PROPS_KEY_HASH(s) folly::hash::fnv32_buf(s, std::strlen(s))
+#define RAW_PROPS_KEY_HASH(s) std::hash<std::string>{}(s)
 
 // Convenience for building setProps switch statements.
 // This injects `fromRawValue` into source; each file that uses

packages/react-native/ReactCommon/react/renderer/core/RawPropsParser.cpp

@@ -198,7 +198,7 @@ void RawPropsParser::iterateOverValues(
 
         auto name = nameValue.utf8(runtime);
 
-        auto nameHash = RAW_PROPS_KEY_HASH(name.c_str());
+        auto nameHash = RAW_PROPS_KEY_HASH(name);
         auto rawValue = RawValue(jsi::dynamicFromValue(runtime, value));
 
         visit(nameHash, name.c_str(), rawValue);
@@ -213,7 +213,7 @@ void RawPropsParser::iterateOverValues(
       for (const auto& pair : dynamic.items()) {
         auto name = pair.first.getString();
 
-        auto nameHash = RAW_PROPS_KEY_HASH(name.c_str());
+        auto nameHash = RAW_PROPS_KEY_HASH(name);
         auto rawValue = RawValue{pair.second};
         visit(nameHash, name.c_str(), rawValue);
       }