[test][sanitizer] Check LINKER_IS_LLD to detect LLD

This enables some tests requiring LLD when we test
compiler-rt activated with LLVM_ENABLE_RUNTIMES.

Author: vitalybuka

compiler-rt/CMakeLists.txt

@@ -708,13 +708,15 @@ if(COMPILER_RT_USE_LIBCXX)
   endif()
 endif()
 
-set(COMPILER_RT_LLD_PATH ${LLVM_MAIN_SRC_DIR}/tools/lld)
-if(EXISTS ${COMPILER_RT_LLD_PATH}/ AND LLVM_TOOL_LLD_BUILD)
-  set(COMPILER_RT_HAS_LLD TRUE)
-else()
-  set(COMPILER_RT_LLD_PATH ${LLVM_MAIN_SRC_DIR}/../lld)
-  if(EXISTS ${COMPILER_RT_LLD_PATH}/ AND LLVM_TOOL_LLD_BUILD)
+if (LINKER_IS_LLD OR LLVM_TOOL_LLD_BUILD)
+  set(COMPILER_RT_LLD_PATH ${LLVM_MAIN_SRC_DIR}/tools/lld)
+  if(EXISTS ${COMPILER_RT_LLD_PATH}/)
     set(COMPILER_RT_HAS_LLD TRUE)
+  else()
+    set(COMPILER_RT_LLD_PATH ${LLVM_MAIN_SRC_DIR}/../lld)
+    if(EXISTS ${COMPILER_RT_LLD_PATH}/)
+      set(COMPILER_RT_HAS_LLD TRUE)
+    endif()
   endif()
 endif()