RFR: JDK-8275909: [JVMCI] c2v_readFieldValue use long instead of jlong for the offset parameter

[Tobias Holenstein]

Changed the type of the displacement in from `long` to `jlong` in C2V_VMENTRY_NULL(jobject, readFieldValue, (JNIEnv* env, jobject, jobject object, jobject expected_type, long displacement, jboolean is_volatile, jobject kind_object))

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Commit messages:
 - JDK-8275909: [JVMCI] c2v_readFieldValue use long instead of jlong for the offset parameter

Changes: https://git.openjdk.java.net/jdk/pull/6158/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6158&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8275909
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6158.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6158/head:pull/6158

PR: https://git.openjdk.java.net/jdk/pull/6158