RFR: 8161379: Force inline methods calling Reflection.getCallerClass

[Claes Redestad]

Hi,

most @CallerSensitive methodscall Reflection.getCallerClass(), which
turn out to have problematic performance characteristics when it fails
to inline.

Making @CallerSensitive imply @ForceInline actually works rather well
across benchmarks, but didn't meet with approval from hotspot-compiler
because it's a hack (unlike @ForceInline /s).

Instead, here is a patch to explicitly @ForceInline those methods where
it can plausibly be helping with performance:

Webrev: http://cr.openjdk.java.net/~redestad/8161379/jdk.01/
Bug: https://bugs.openjdk.java.net/browse/JDK-8161379

Thanks!

/Claes