[jdk17u-dev] RFR: 8310126: C1: Missing receiver null check in Reference::get intrinsic

[Aleksey Shipilev]

Clean backport to fix JDK 11 regression in C1.

Additional testing:
 - [ ] New test fails before the patch, passes with it
 - [ ] Linux AArch64 fastdebug `tier1 tier2 tier3`

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Commit messages:
 - Backport 02aaab12e331e5a4c249f1d281c4439e2e7c914f

Changes: https://git.openjdk.org/jdk17u-dev/pull/1474/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1474&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/jdk17u-dev/pull/1474.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1474/head:pull/1474

PR: https://git.openjdk.org/jdk17u-dev/pull/1474