Allow to specify toolchain for dump-static-initializers.py
By default dump-static-initializers.py uses objdump from the PATH which is
usually host system's default which supports x86/x86_64 but doesn't support
CPU architectures used on Android, like ARM or MIPS. This change allows
a developer to select toolchain from NDK by specifying prefix for the tools
with "-t ndk/toolchains/aarch64-linux-android-4.9/.../aarch64-linux-android-"
(full path shortened to fit in 80 symbols).
BUG=492513
R=thakis@chromium.org
Review URL: https://codereview.chromium.org/
1158153002
Cr-Commit-Position: refs/heads/master@{#331551}