compiler: frame reduction optimizations.

These optimizations have to do with moving a (frame x y)
instruction past the next instruction. The goal is to move the
frame past a conditional branch, under the right
circumstances, so that the frame is eliminated when the branch
is taken.

* share/txr/stdlib/optimize.tl (basic-blocks (cut-block,
next-block)): New methods.
(basic-block peephole): Add two patterns: one to move a frame
past a mov, call or gcall. Another more complicated one to
move it past an if which jumps to an end.

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