Hermes: Use shared JSI from React Native on iOS (facebook#33885)

Summary:
Pull Request resolved: facebook#33885

When building Hermes for React Native, point to the React Native JSI location to ensure both React Native and Hermes use the exact same version of JSI.

Changelog:
[iOS] [Changed] - When Hermes is enabled, it will use the same copy of JSI as React Native

Differential Revision: D36567471

fbshipit-source-id: a0626aa3cf370a15bea7533231b189a332f538b2

sdks/hermes-engine/utils/build-apple-framework.sh

@@ -12,6 +12,7 @@ fi
 
 NUM_CORES=$(sysctl -n hw.ncpu)
 IMPORT_HERMESC_PATH=${HERMES_OVERRIDE_HERMESC_PATH:-$PWD/build_host_hermesc/ImportHermesc.cmake}
+JSI_PATH="$PWD/../../ReactCommon/jsi"
 
 function get_release_version {
   ruby -rcocoapods-core -rjson -e "puts Pod::Specification.from_file('hermes-engine.podspec').version"
@@ -59,6 +60,9 @@ function configure_apple_framework {
     -DHERMES_BUILD_APPLE_DSYM:BOOLEAN=true \
     -DHERMES_ENABLE_TOOLS:BOOLEAN="$build_cli_tools" \
     -DIMPORT_HERMESC:PATH="$IMPORT_HERMESC_PATH" \
+    -DJSI_DIR="$JSI_PATH" \
+    -DHERMES_BUILD_SHARED_JSI=true \
+    -DHERMES_RELEASE_VERSION="for RN $(get_release_version)" \
     -DCMAKE_INSTALL_PREFIX:PATH=../destroot \
     -DCMAKE_BUILD_TYPE="$BUILD_TYPE"
 }