Fastalloc Def branch arg on branch & Bug Fixes#240

Merged

cfallin merged 6 commits intobytecodealliance:mainfrom

d-sonuga:def-branch-arg-on-branch

Sep 18, 2025

Commits on Sep 18, 2025

Add support for any, fixed-reg and stack-only branch arguments being defined in its branch instruction
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Correct `allocd_within_constraint` to account for allocating of clobbers to late phase registers.
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Remove over-constraint on available registers by removing clobbers only from the late available register set.
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update fastalloc doc
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formatting
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panic when a block has multiple predecessors with one of them defining a branch arg on the branch & improve code clarity of decrementing counters when allocating scratch registers
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