Reland "[StackColoring] Remap PseudoSourceValue frame indices via...

Reland "[StackColoring] Remap PseudoSourceValue frame indices via MachineFunction::getPSVManager()""

Reland 7a8b0b15, with a fix that checks
`!E.value().empty()` to avoid inserting a zero to SlotRemap.

Debugged by rnk@ in https://bugs.chromium.org/p/chromium/issues/detail?id=1045650#c33

Reviewed By: rnk

Differential Revision: https://reviews.llvm.org/D73510