Enable specification of function ranges for JIT config values

Currently there is ifdefed out in several places in the JIT that take a low and high hash value to enable binary search for optimization or register allocation issues:

• minoptshashlo/minoptshashhi in compiler.cpp
• JitStressRegsHashLo/JitStressRegsHashHi in lsra.cpp
• structpromohashlo/structpromohashhi in morph.cpp
• loopclonehashlo/loopclonehashhi in optimizer.cpp
• loophoisthashlo/loophoisthashhi in optimizer.cpp

Each of these does their own processing.

There's also COMPlus_JitFunctionFile that allows the specification of a file with a list of functions. It would be good to have a general mechanism to specify:

• A range of method hash values
• A range of method count (Compiler::jitTotalMethodCompiled) - useful when the JIT order is reasonably stable and there are many methods with the same hash and/or in combination with a range of hash values when multiple methods must be included to reproduce a failure. This was valuable in tracking down dotnet/runtime#12993.
• A COMPlus value that is enabled only for the methods included in the set

category:implementation theme:jit-coding-style skill-level:beginner cost:small