RFR: 8288781: C1: LIR_OpVisitState::maxNumberOfOperands too small

[Richard Reingruber]

Increment `LIR_OpVisitState::maxNumberOfOperands` by 1 to allow C1 compilation of a method that receives 21 parameters in registers instead of crashing.

Add regression test. The regression test crashes on ppc because there all parameters (8 integer + 13 float = 21) can be passed in registers.

The fix passed our CI testing. This includes most JCK and JTREG test, also in Xcomp mode, on the standard platforms and also on Linux/PPC64le.

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Commit messages:
 - Increment LIR_OpVisitState::maxNumberOfOperands
 - Regression test TestManyMethodParameters.java

Changes: https://git.openjdk.org/jdk19/pull/51/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk19&pr=51&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8288781
  Stats: 58 lines in 2 files changed: 57 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk19/pull/51.diff
  Fetch: git fetch https://git.openjdk.org/jdk19 pull/51/head:pull/51

PR: https://git.openjdk.org/jdk19/pull/51