jumper, explicitly tag functions as functions

This helps the linker decide to rewrite bl -> blx when linking
Thumb2 SkJumper.o code with ARM SkJumper_generated.o.

The reason Android wasn't failing is because it somehow figured
out to do this without these .type directives.  We use a different
toolchain for ChromeOS builds that I guess needs more handholding.

BUG=skia:6471

CQ_INCLUDE_TRYBOTS=skia.primary:Test-ChromeOS-Clang-Chromebook_C100p-GPU-MaliT764-arm-Release,Test-ChromeOS-Clang-Chromebook_C100p-GPU-MaliT764-arm-Debug

Change-Id: I4a5c50b6ab7683512776c70aec6e9a75a0999787
Reviewed-on: https://skia-review.googlesource.com/13464
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
4 files changed