[WebAssembly] Enable register coloring and register stackifying.

Description

[WebAssembly] Enable register coloring and register stackifying.

This also takes the push/pop syntax another step forward, introducing stack
slot numbers to make it easier to see how expressions are connected. For
example, the value pushed in $push7 is popped in $pop7.

And, this begins an experiment with making get_local and set_local implicit
when an operation directly uses or defines a register. This greatly reduces
clutter. If this experiment succeeds, it may make sense to do this for
const instructions as well.

And, this introduces more special code for ARGUMENTS; hopefully this code
will soon be obviated by proper support for live-in virtual registers.

Details

Committed
djgNov 18 2015, 8:12 AM
Parents
rL253464: Fix bug where WinCOFFObjectWriter would assume starting from an empty output.
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