[jdk11u-dev] RFR: 8263776: [JVMCI] add helper to perform Java upcalls [v2]

[Severin Gehwolf]

> Here is a backport for JDK-8263776. The patch doesn't apply cleanly since it uses features only introduced with JDK-8230199 (JDK 15+, not in OpenJDK 11u). This patch is the same labsopenjdk 11 uses. This patch is also needed for using graal js with plain OpenJDK.
> 
> Testing: test/hotspot/jtreg/compiler/jvmci and manual upstream Graal unit test.

Severin Gehwolf has updated the pull request incrementally with one additional commit since the last revision:

  Cleanup whitespace

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Changes:
  - all: https://git.openjdk.java.net/jdk11u-dev/pull/279/files
  - new: https://git.openjdk.java.net/jdk11u-dev/pull/279/files/59d1b306..7b7e3407

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=279&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=279&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/279.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/279/head:pull/279

PR: https://git.openjdk.java.net/jdk11u-dev/pull/279