[BOLT][Instrumentation] Initial instrumentation support for RISCV64 (#133882)

This patch adds code generation for RISCV64 instrumentation.The work
    involved includes the following three points:

a) Implements support for instrumenting direct function call and jump
    on RISC-V which relies on , Atomic instructions
    (used to increment counters) are only available on RISC-V when the A
    extension is used.

b) Implements support for instrumenting direct function inderect call
    by implementing the createInstrumentedIndCallHandlerEntryBB and
createInstrumentedIndCallHandlerExitBB interfaces. In this process, we
    need to accurately record the target address and IndCallID to ensure
    the correct recording of the indirect call counters.

c)Implemented the RISCV64 Bolt runtime library, implemented some system
call interfaces through embedded assembly. Get the difference between
runtime addrress of .text section andstatic address in section header
table, which in turn can be used to search for indirect call
description.

However, the community code currently has problems with relocation in
    some scenarios, but this has nothing to do with instrumentation. We
    may continue to submit patches to fix the related bugs.

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