[Sanitizer] [Scudo] Add riscv64 support for scudo

[joshua-arch1]

Summary

Enable Scudo on RISCV64 on both clang side and compiler-rt side.

[joshua-arch1]

Ping.

[luismarques]

I see no reason not to accept this. I've checked that the tests pass.
LGTM.

[hiraditya]

@joshua-arch1 i can land this on your behalf if you think this is good to go.

[MaskRay]

2538e550420fed5036d224fd93e9145c845f0ffe contains Reviewers: cryptoad, eugenis, vitalybuka, luismarques, hiraditya.
The reviewer list isn't useful. Just drop it for future commits.

clang/lib/Driver/ToolChains/Linux.cpp

SanitizerMask Linux::getSupportedSanitizers() const {
   if (IsX86_64 || IsMIPS64 || IsAArch64 || IsPowerPC64 || IsSystemZ ||
       IsLoongArch64)
     Res |= SanitizerKind::Thread;
   if (IsX86_64)
     Res |= SanitizerKind::KernelMemory;
   if (IsX86 || IsX86_64)
     Res |= SanitizerKind::Function;
   if (IsX86_64 || IsMIPS64 || IsAArch64 || IsX86 || IsMIPS || IsArmArch ||
-      IsPowerPC64 || IsHexagon || IsLoongArch64)
+      IsPowerPC64 || IsHexagon || IsLoongArch64 || IsRISCV64)
     Res |= SanitizerKind::Scudo;
   if (IsX86_64 || IsAArch64 || IsRISCV64) {
     Res |= SanitizerKind::HWAddress;
   }
   if (IsX86_64 || IsAArch64) {
     Res |= SanitizerKind::KernelHWAddress;
   }
   return Res;

clang/test/Driver/fsanitize.c

 // RUN: %clang --target=i386-linux-gnu -fsanitize=scudo %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-SCUDO
 // RUN: %clang --target=loongarch64-unknown-linux-gnu -fsanitize=scudo %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-SCUDO
 // RUN: %clang --target=mips64-unknown-linux-gnu -fsanitize=scudo %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-SCUDO
 // RUN: %clang --target=mips64el-unknown-linux-gnu -fsanitize=scudo %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-SCUDO
 // RUN: %clang --target=mips-unknown-linux-gnu -fsanitize=scudo %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-SCUDO
 // RUN: %clang --target=mipsel-unknown-linux-gnu -fsanitize=scudo %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-SCUDO
 // RUN: %clang --target=powerpc64-unknown-linux -fsanitize=scudo %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-SCUDO
 // RUN: %clang --target=powerpc64le-unknown-linux -fsanitize=scudo %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-SCUDO
+// RUN: %clang --target=riscv64-linux-gnu -fsanitize=scudo %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-SCUDO
 // CHECK-SCUDO: "-fsanitize=scudo"
 
 // RUN: %clang --target=x86_64-linux-gnu -fsanitize=scudo %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-SCUDO-PIE
 // RUN: %clang --target=arm-linux-androideabi -fsanitize=scudo %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-SCUDO-PIE
 // CHECK-SCUDO-PIE: "-mrelocation-model" "pic" "-pic-level" "2" "-pic-is-pie"
 // CHECK-SCUDO-PIE: "-pie"
 
 // RUN: %clang --target=x86_64-linux-gnu -fsanitize=scudo,undefined %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-SCUDO-UBSAN

compiler-rt/cmake/Modules/AllSupportedArchDefs.cmake

 set(ALL_UBSAN_SUPPORTED_ARCH ${X86} ${X86_64} ${ARM32} ${ARM64} ${RISCV64}
     ${MIPS32} ${MIPS64} ${PPC64} ${S390X} ${SPARC} ${SPARCV9} ${HEXAGON}
     ${LOONGARCH64})
 set(ALL_SAFESTACK_SUPPORTED_ARCH ${X86} ${X86_64} ${ARM64} ${MIPS32} ${MIPS64}
     ${HEXAGON} ${LOONGARCH64})
 set(ALL_CFI_SUPPORTED_ARCH ${X86} ${X86_64} ${ARM32} ${ARM64} ${MIPS64}
     ${HEXAGON})
 set(ALL_SCUDO_STANDALONE_SUPPORTED_ARCH ${X86} ${X86_64} ${ARM32} ${ARM64}
-    ${MIPS32} ${MIPS64} ${PPC64} ${HEXAGON} ${LOONGARCH64})
+    ${MIPS32} ${MIPS64} ${PPC64} ${HEXAGON} ${LOONGARCH64} ${RISCV64})
 if(APPLE)
 set(ALL_XRAY_SUPPORTED_ARCH ${X86_64})
 else()
 set(ALL_XRAY_SUPPORTED_ARCH ${X86_64} ${ARM32} ${ARM64} ${MIPS32} ${MIPS64}
     powerpc64le ${HEXAGON})
 endif()
 set(ALL_SHADOWCALLSTACK_SUPPORTED_ARCH ${ARM64})
 
 if (UNIX)
 set(ALL_ORC_SUPPORTED_ARCH ${X86_64} ${ARM64} ${ARM32})
 endif()
 
 if (WIN32)
   set(ALL_ORC_SUPPORTED_ARCH ${X86_64})
 endif()