[RyuJIT][LSRA] Consider pre-allocating high-frequency lclVars

[CarolEidt]

This would require the use of a different data structure for the RegRecord, at least for the non-MinOpts case, as the current data structure only tracks the register contents for the Location currently being allocated or written-back.
Consideration would need to be given to JIT throughput, possibly using an alternate representation or approach for MinOpts.
category:cq
theme:register-allocator
skill-level:expert
cost:medium

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