[compiler-rt] Fix interception_win.cpp arm64 instruction lengths

Updates GetInstructionSize to account for arm64 instruction sizes.

ARM64 instruction are always 4 bytes long but GetInstructionSize in
interception_win.cpp assumes x86_64 which has mixed sizes.

Fix is for: #64319

Before the changeclang_rt.asan_dynamic-aarch64.dll would crash at:
OverrideFunction -> OverrideFunctionWithHotPatch -> GetInstructionSize:825

After the change:
dllthunkintercept -> dllthunkgetrealaddressordie -> InternalGetProcAddress

Author: farzonl

compiler-rt/lib/interception/interception_win.cpp

@@ -457,6 +457,11 @@ static const u8 kPrologueWithShortJump2[] = {
 
 // Returns 0 on error.
 static size_t GetInstructionSize(uptr address, size_t* rel_offset = nullptr) {
+#if SANITIZER_ARM64
+  // An ARM64 instruction is 4 bytes long.
+  return 4;
+#endif
+
 #if SANITIZER_WINDOWS64
   if (memcmp((u8*)address, kPrologueWithShortJump1,
              sizeof(kPrologueWithShortJump1)) == 0 ||