[jdk8u-dev] RFR: 8150669: C1 intrinsic for Class.isPrimitive

[Dongbo He]

Hi, 

Please review this backport. The original purpose is to backport fix for [JDK-8239477](https://bugs.openjdk.java.net/browse/JDK-8239477). But this depends on fix for [JDK-8150669](https://bugs.openjdk.java.net/browse/JDK-8150669) & [JDK-8233019](https://bugs.openjdk.java.net/browse/JDK-8233019).

Performed full jtreg test both on x86_64-linux-gnu and aarch64-linux-gnu platforms. 

This PR has been reviewed by Paul and approved before move to github: https://mail.openjdk.java.net/pipermail/jdk8u-dev/2021-August/014155.html

Follow-up fix [JDK-8233019](https://bugs.openjdk.java.net/browse/JDK-8233019) is planned to be backported as well.

(I made this PR on behalf of fyang)

Thanks,
hedongbo

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Commit messages:
 - Backport 890f94d7e6be731ac2ebae2f1ad3cc20ec836115

Changes: https://git.openjdk.java.net/jdk8u-dev/pull/37/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk8u-dev&pr=37&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8150669
  Stats: 198 lines in 5 files changed: 197 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk8u-dev/pull/37.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk8u-dev pull/37/head:pull/37

PR: https://git.openjdk.java.net/jdk8u-dev/pull/37