RFR: 8373633: C2: Use interface receiver type to improve CHA decisions

[Vladimir Ivanov]

Strength-reducing an interface call to a virtual call for interfaces with
unique implementors can use receiver type information to narrow the context.

C2 tracks interface types and receiver type information can be used to reveal
an interface with a unique implementor which can't be derived from the call
site itself.

Since C2 effectively accumulates a union interface type from multiple subtype checks, iterating over individual components of a type may reveal a candidate for a strength-reduction. The only prerequisite is that a candidate has to be a subtype of the declared interface.  

Testing: hs-tier1 - hs-tier5

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Commit messages:
 - Use receiver type to improve CHA decisions

Changes: https://git.openjdk.org/jdk/pull/28811/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28811&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8373633
  Stats: 255 lines in 7 files changed: 157 ins; 51 del; 47 mod
  Patch: https://git.openjdk.org/jdk/pull/28811.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28811/head:pull/28811

PR: https://git.openjdk.org/jdk/pull/28811