fix memory leak issue #2871 #1622

Job	Run time
clang-compile-with-bazel-all-options	16m 39s
clang-compile-with-bazel-all-options	16m 39s
clang-compile-with-bazel	16m 1s
clang-compile-with-bazel	16m 1s
clang-compile-with-cmake	2m 43s
clang-compile-with-cmake	2m 43s
clang-compile-with-boringssl	18m 6s
clang-compile-with-boringssl	18m 6s
clang-compile-with-cmake-all-options	2m 41s
clang-compile-with-cmake-all-options	5m 15s
clang-compile-with-make	3m 0s
clang-compile-with-make	3m 0s
clang-compile-with-make-all-options	5m 21s
clang-compile-with-make-all-options	5m 21s
clang-unittest	10m 57s
clang-unittest	11m 50s
gcc-compile-with-bazel	16m 48s
gcc-compile-with-bazel	16m 48s
gcc-compile-with-bazel-all-options	18m 10s
gcc-compile-with-bazel-all-options	18m 10s
gcc-compile-with-boringssl	18m 5s
gcc-compile-with-boringssl	18m 5s
gcc-compile-with-cmake	3m 17s
gcc-compile-with-cmake	3m 17s
gcc-compile-with-cmake-all-options	5m 35s
gcc-compile-with-cmake-all-options	5m 35s
gcc-compile-with-make	2m 55s
gcc-compile-with-make	2m 55s
gcc-compile-with-make-all-options	5m 5s
gcc-compile-with-make-all-options	5m 5s
	4h 54m 13s

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