review for 7062856: Disassembler needs to be smarter about finding hsdis after 1.7 launcher changes

[Tom Rodriguez]

http://cr.openjdk.java.net/~never/7062856
29 lines changed: 27 ins; 0 del; 2 mod; 487 unchg

7062856: Disassembler needs to be smarter about finding hsdis after 1.7 launcher changes
Summary: do explicit lookup emulating old LD_LIBRARY_PATH search
Reviewed-by:

Changes to launcher in the JDK7 removed the default setting of
LD_LIBRARY_PATH which was being used to find the disassembler.  I
added explicit logic to perform a lookup equivalent to the previous
behaviour.  Tested with truss to confirm search paths and
PrintNMethods.

I also fixed an annoyance where every separate invocation of the
disassembler emitted the "Disassembling ..." message so that it would
only print it again if it changed.