[compiler-rt][profile][RISCV]: Enable Compiler-RT profile build on RISC-V

[luismarques]

Summary

All of the relevant tests pass.

[vsk]

It's great to see this. Will these tests get picked up by an existing RISCV bot?

[luismarques]

In D97966#2604312, @vsk wrote:

It's great to see this. Will these tests get picked up by an existing RISCV bot?

There is no RISC-V bot at the moment. That's something I plan to work on once I have Linux-capable RISC-V hardware (hopefully soon). At the moment I'm just using QEMU for this kind of work, which I feel is too slow for a bot.

[vsk]

It might help to have a bot online first to avoid shipping a regressed libprofile for RISCV, but I don't want to hold up work that depends on this. I'm not sure what the right call is, cc'ing @ro and @eugenis who have past experience (D40943)

[MaskRay]

Consider adding RISCV32 as well to avoid future churn when adding RISCV32.

As @vsk said, having a built bot is strongly encouraged, but is probably not a strict requirement.

FYI: https://github.com/llvm/llvm-iwg/issues/66 is discussing a riscv64 build bot.

compiler-rt/cmake/config-ix.cmake

if(APPLE)
   set(ALL_LSAN_SUPPORTED_ARCH ${X86} ${X86_64} ${MIPS64} ${ARM64})
 else()
   set(ALL_LSAN_SUPPORTED_ARCH ${X86} ${X86_64} ${MIPS64} ${ARM64} ${ARM32} ${PPC64} ${S390X} ${RISCV64})
 endif()
 set(ALL_MSAN_SUPPORTED_ARCH ${X86_64} ${MIPS64} ${ARM64} ${PPC64} ${S390X})
 set(ALL_HWASAN_SUPPORTED_ARCH ${X86_64} ${ARM64})
 set(ALL_MEMPROF_SUPPORTED_ARCH ${X86_64})
 set(ALL_PROFILE_SUPPORTED_ARCH ${X86} ${X86_64} ${ARM32} ${ARM64} ${PPC32} ${PPC64}
-    ${MIPS32} ${MIPS64} ${S390X} ${SPARC} ${SPARCV9})
+    ${MIPS32} ${MIPS64} ${S390X} ${SPARC} ${SPARCV9} ${RISCV64})
 set(ALL_TSAN_SUPPORTED_ARCH ${X86_64} ${MIPS64} ${ARM64} ${PPC64})
 set(ALL_UBSAN_SUPPORTED_ARCH ${X86} ${X86_64} ${ARM32} ${ARM64} ${RISCV64}
     ${MIPS32} ${MIPS64} ${PPC64} ${S390X} ${SPARC} ${SPARCV9})
 set(ALL_SAFESTACK_SUPPORTED_ARCH ${X86} ${X86_64} ${ARM64} ${MIPS32} ${MIPS64})
 set(ALL_CFI_SUPPORTED_ARCH ${X86} ${X86_64} ${ARM32} ${ARM64} ${MIPS64})
 set(ALL_SCUDO_SUPPORTED_ARCH ${X86} ${X86_64} ${ARM32} ${ARM64} ${MIPS32} ${MIPS64} ${PPC64})
 set(ALL_SCUDO_STANDALONE_SUPPORTED_ARCH ${X86} ${X86_64})
 if(APPLE)