Remove jl_cumulative_compile_time_ns(), since it's not actually an accurate measurement

Author: NHDaly

base/timing.jl

@@ -58,8 +58,6 @@ end
 # cumulative total time spent on compilation, in nanoseconds
 cumulative_compile_time_ns_before() = ccall(:jl_cumulative_compile_time_ns_before, UInt64, ())
 cumulative_compile_time_ns_after() = ccall(:jl_cumulative_compile_time_ns_after, UInt64, ())
-# cumulative total time the process has spent on compilation while measurement was enabled.
-cumulative_compile_time_ns() = ccall(:jl_cumulative_compile_time_ns, UInt64, ())
 
 # total time spend in garbage collection, in nanoseconds
 gc_time_ns() = ccall(:jl_gc_total_hrtime, UInt64, ())

src/jitlayers.cpp

@@ -90,11 +90,6 @@ uint64_t jl_cumulative_compile_time_ns_after()
     return jl_atomic_load(&jl_cumulative_compile_time);
 }
 
-extern "C" JL_DLLEXPORT
-uint64_t jl_cumulative_compile_time_ns() {
-    return jl_atomic_load(&jl_cumulative_compile_time);
-}
-
 // this generates llvm code for the lambda info
 // and adds the result to the jitlayers
 // (and the shadow module),