Added gdb-jit interface support for ARM. Compressed .debug_line table by 1)

Added gdb-jit interface support for ARM. Compressed .debug_line table by 1)
removing duplicate adjacent entries having the same line number, and 2) using
special opcodes to encode multiple machine register state changes in one byte.
Also made a fix involving the order in which static initializers are performed.

Patch by Shasank Chavan of Hewlett-Packard Development Company, LP

BUG=none
TEST=Try building for arm

Review URL: http://codereview.chromium.org/6524020

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6801 ce2b1a6d-e550-0410-aec6-3dcde31c8c00