[13] RFR (XS): 8191998: C2: inlining through MH linkers drops speculative part of argument types

[Vladimir Ivanov]

http://cr.openjdk.java.net/~vlivanov/8191998/webrev.00/
https://bugs.openjdk.java.net/browse/JDK-8191998

CallGenerator::for_method_handle_inline() casts MH linker (MH::linkTo*) 
arguments before attempting inlining. If any argument has a speculative 
type attached, it is lost and can't be used later.

The patch preserves speculative part while sharpening the type (if 
needed) based on static information from the MemberName instance.

Testing: hs-precheckin-comp, hs-tier1, hs-tier2.

Best regards,
Vladimir Ivanov