[jdk21] RFR: 8310126: C1: Missing receiver null check in Reference::get intrinsic

[Tobias Hartmann]

Backport of [JDK-8310126](https://bugs.openjdk.java.net/browse/JDK-8310126). Applies cleanly.

Thanks,
Tobias

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Commit messages:
 - 8310126: C1: Missing receiver null check in Reference::get intrinsic

Changes: https://git.openjdk.org/jdk21/pull/51/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21&pr=51&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8310126
  Stats: 63 lines in 2 files changed: 62 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk21/pull/51.diff
  Fetch: git fetch https://git.openjdk.org/jdk21.git pull/51/head:pull/51

PR: https://git.openjdk.org/jdk21/pull/51