Merge to GCC 4.8.1
Add skeleton 6502 port.
build fixes
more compilation
Almost kind of struggles to emit some code, a bit!
starting to compile some really simple things
Some of this reload funny business is working
more bugs/improvements
peephole2 can improve accumulator-to-zp case
addhi peephole
more bits and pieces
fix symbol_ref+const addresses
shift tweaks and things
More shifts, and start of conditional branches (HImode eq, ne).
Add length attributes, plus minor tidyups.
HImode compare-equal working with post-reload splitter.
small bugfixes/tidyups
Tweaks, fix compilation of several small test programs.
Handles some code with indirection etc. a little better
HImode compare-not-equal splitting, and movhi expander tweak.