[StackColoring] Change the StackColoring logic + enables it to handle spills#143800

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Ralender wants to merge 19 commits intollvm:mainfrom

Ralender:NewStackColoring

Commits on Jun 19, 2025

[NFC][StackColoring] Remove unused member for StackColoring
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[NFC][StackColoring] Use LiveRange instead of LiveInterval in StackColoring
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[NFC] make constructor explicit LiveRange
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[NFC] MachineFrameInfo::print add a bit more informations
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[NFC][StackSlotColoring] Remove dead code
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[NFC][StackColoring] Use block numbers instead of maps
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[NFC] Move NumDigits to MathExtras.h and update some users of log10 to use NumDigits
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[NFC] Improve debug output of StackColoring
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[NFC][LiveStacks] Use vectors instead of map and unordred_map
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[NFC][CodeGen] Cleanup lifetime in StackColoring instead of DeadMachineInstructionElim
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[CodeGen] Add option to move StackColoring after register allocation + deal with direct fallout
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