RFR: 8146936: Convert TraceBiasedLocking to Unified Logging

[Rachel Protacio]

Hello,

Please review this change converting TraceBiasedLocking to UL, i.e. 
-Xlog:biasedlocking. *This* flag is product-level (sorry about the 
confusion on the last one!) so the existing option has been aliased to 
the logging tag.

Bug: https://bugs.openjdk.java.net/browse/JDK-8149383
Open webrev: http://cr.openjdk.java.net/~rprotacio/8149383/

Passes JPRT and RBT quick and non-colo tests.

Sample of previous output (with ellipses in place of many lines of 
"Aligned thread"):

    $ java -XX:+TraceBiasedLocking -XX:BiasedLockingStartupDelay=0 -version
    Aligned thread 0x00007fe9480192c0 to 0x00007fe948019800
    Aligned thread 0x00007fe94803a850 to 0x00007fe94803b000
    Aligned thread 0x00007fe94803c390 to 0x00007fe94803c800
    ...
    Aligned thread 0x00007fe948400180 to 0x00007fe948400800
    Aligned thread 0x00007fe94840ef00 to 0x00007fe94840f000
    Biased locking enabled
    Aligned thread 0x00007fe948410a20 to 0x00007fe948411000
    java version "9-internal"
    Java(TM) SE Runtime Environment (fastdebug build
    9-internal+0-2016-02-08-180545.rprotaci.clean)
    Java HotSpot(TM) 64-Bit Server VM (fastdebug build
    9-internal+0-2016-02-08-180545.rprotaci.clean, mixed mode)
    Aligned thread 0x00007fe9480192c0 to 0x00007fe948019800

Sample of new output (with ellipses in place of many lines of "Aligned 
thread"):

    $ java -Xlog:biasedlocking -XX:BiasedLockingStartupDelay=0 -version
    [0.026s][info][biasedlocking] Aligned thread 0x00007fa194019480 to
    0x00007fa194019800
    [0.056s][info][biasedlocking] Aligned thread 0x00007fa19403aa80 to
    0x00007fa19403b000
    [0.056s][info][biasedlocking] Aligned thread 0x00007fa19403c5c0 to
    0x00007fa19403c800
    ...
    [0.362s][info][biasedlocking] Aligned thread 0x00007fa194400430 to
    0x00007fa194400800
    [0.367s][info][biasedlocking] Aligned thread 0x00007fa194417160 to
    0x00007fa194417800
    [0.383s][info][biasedlocking] Biased locking enabled
    [0.384s][info][biasedlocking] Aligned thread 0x00007fa194418d60 to
    0x00007fa194419000
    java version "9-internal"
    Java(TM) SE Runtime Environment (fastdebug build
    9-internal+0-2016-02-09-124441.rprotaci.biasedlocking)
    Java HotSpot(TM) 64-Bit Server VM (fastdebug build
    9-internal+0-2016-02-09-124441.rprotaci.biasedlocking, mixed mode)
    [0.389s][info][biasedlocking] Aligned thread 0x00007fa194019480 to
    0x00007fa194019800

A comment on the code: in order to maintain the existing functionality 
of the "(TraceBiasedLocking && (Verbose || !is_bulk))" portions of code, 
it was necessary to create two separate cases in the conversion, one 
each for the info (regular) and trace (verbose) levels. It has been 
asked that the functionality be maintained. The logging statements in 
these chunks do not necessarily have to stay equal to each other in the 
future, which this would facilitate.


Thank you,
Rachel