Ensure that only one compiler-rt component is created for lsan

[fjricci]

Summary

The lsan cmake configuration failed when targeting more
than one architecture, because it would attempt to create multiple
components with the same name. Ensure that only one lsan component
is ever created.

[fjricci]

Update to use individual symbols names

[fjricci]

Undo upload of incorrect commit

compiler-rt/trunk/lib/lsan/CMakeLists.txt

 
 add_compiler_rt_object_libraries(RTLSanCommon
     OS ${SANITIZER_COMMON_SUPPORTED_OS}
     ARCHS ${LSAN_COMMON_SUPPORTED_ARCH}
     SOURCES ${LSAN_COMMON_SOURCES}
     CFLAGS ${LSAN_CFLAGS})
 
 if(COMPILER_RT_HAS_LSAN)
-  foreach(arch ${LSAN_SUPPORTED_ARCH})
-    add_compiler_rt_component(lsan)
-    
+  foreach(arch ${LSAN_SUPPORTED_ARCH})
     add_compiler_rt_runtime(clang_rt.lsan
       STATIC
       ARCHS ${arch}
       SOURCES ${LSAN_SOURCES}
               $<TARGET_OBJECTS:RTInterception.${arch}>
               $<TARGET_OBJECTS:RTSanitizerCommon.${arch}>
               $<TARGET_OBJECTS:RTSanitizerCommonLibc.${arch}>
               $<TARGET_OBJECTS:RTLSanCommon.${arch}>
       CFLAGS ${LSAN_CFLAGS}
       PARENT_TARGET lsan)
   endforeach()
 endif()