Implement reserveAllocationSpace for SectionMemoryManager (#71968) Implements `reserveAllocationSpace` and provides an option to enable `needsToReserveAllocationSpace` for large-memory environments with AArch64. The [AArch64 ABI](https://github.com/ARM-software/abi-aa/blob/main/sysvabi64/sysvabi64.rst#7code-models) has restrictions on the distance between TEXT and GOT sections as the instructions to reference them are limited to 2 or 4GB. Allocating sections in multiple blocks can result in distances greater than that on systems with lots of memory. In those environments several projects using SectionMemoryManager with MCJIT have run across assertion failures for the R_AARCH64_ADR_PREL_PG_HI21 instruction as it attempts to address across distances greater than 2GB (an int32). Fixes #71963 by allocating all sections in a single contiguous memory allocation, limiting the distance required for instruction offsets similar to how pre-compiled binaries would be loaded into memory. Co-authored-by: Lang Hames <lhames@gmail.com>
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