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This is an umbrella RFE to gather calling convention related improvements and cleanups.

relates to

JDK-8344243 [lworld] Scalarization of sealed value abstract classes/interfaces in the calling convention

JDK-8271370 [lworld] Avoid saving all registers before slow call in G1 barrier

JDK-8278390 [lworld] Scalarization of nullable inline types in the calling convention

1.	[lworld] Remove reserved entries from the calling convention	Resolved	Tobias Hartmann
2.	[lworld] Investigate impact of calling convention on stack banging	Open	Tobias Hartmann
3.	[lworld] C2 should keep track of the oop even if an inline type is returned as fields	Resolved	Tobias Hartmann
4.	[lworld] Inline type allocation might be kept alive by return	Open	Quan Anh Mai
5.	[lworld] We need a reasonable limit for the calling convention	Open	Unassigned