ShatianWang 076bd22f57 [BOLT] Add structure of CDSplit to SplitFunctions (#73430) ...

This commit establishes the general structure of the CDSplit strategy in
SplitFunctions without incorporating the exact splitting logic. With
-split-functions -split-strategy=cdsplit, the SplitFunctions pass will
run twice: the first time is before function reordering and functions
are hot-cold split; the second time is after function reordering and
functions are hot-warm-cold split based on the fixed function ordering.
Currently, all functions are hot-warm split after the entry block in the
second splitting pass. Subsequent commits will introduce the precise
splitting logic. NFC.

2023-11-29 15:43:21 -05:00

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