[fuzzer] Enable loongarch64

[tangyouling]

Summary

Enable fuzzer on loongarch64.

[xen0n]

compiler-rt/lib/fuzzer/FuzzerUtil.h

98 ↗

(On Diff #485013)

IMO don't squeeze this and the GetNextInstructionPc enablement into one patch. This line of change actually works independently of architectures and could benefit others too.

[tangyouling]

compiler-rt/lib/fuzzer/FuzzerUtil.h

98 ↗

(On Diff #485013)

OK, thanks.

[tangyouling]

Separate FuzzerUtil.h modification.

[xen0n]

LGTM, thanks!

[Ami-zhang]

rebase

compiler-rt/cmake/Modules/AllSupportedArchDefs.cmake

 if(ANDROID)
   set(OS_NAME "Android")
 else()
   set(OS_NAME "${CMAKE_SYSTEM_NAME}")
 endif()
 
 if(OS_NAME MATCHES "Linux")
   set(ALL_FUZZER_SUPPORTED_ARCH ${X86} ${X86_64} ${ARM32} ${ARM64} ${S390X}
-      ${RISCV64})
+      ${RISCV64} ${LOONGARCH64})
 elseif (OS_NAME MATCHES "Windows")
   set(ALL_FUZZER_SUPPORTED_ARCH ${X86} ${X86_64})
 elseif(OS_NAME MATCHES "Android")
   set(ALL_FUZZER_SUPPORTED_ARCH ${X86} ${X86_64} ${ARM32} ${ARM64} ${RISCV64})
 elseif(OS_NAME MATCHES "Fuchsia")
   set(ALL_FUZZER_SUPPORTED_ARCH ${X86_64} ${ARM64} ${RISCV64})
 else()
   set(ALL_FUZZER_SUPPORTED_ARCH ${X86_64} ${ARM64})

compiler-rt/lib/fuzzer/FuzzerTracePC.cpp

 #endif
 }
 
 /// \return the address of the next instruction.
 /// Note: the logic is copied from `sanitizer_common/sanitizer_stacktrace.cpp`
 ALWAYS_INLINE uintptr_t TracePC::GetNextInstructionPc(uintptr_t PC) {
 #if defined(__mips__)
   return PC + 8;
-#elif defined(__powerpc__) || defined(__sparc__) || defined(__arm__) || \
-    defined(__aarch64__)
+#elif defined(__powerpc__) || defined(__sparc__) || defined(__arm__) ||        \
+    defined(__aarch64__) || defined(__loongarch__)
   return PC + 4;
 #else
   return PC + 1;
 #endif
 }
 
 void TracePC::UpdateObservedPCs() {
   std::vector<uintptr_t> CoveredFuncs;