[Zucchini] Generic suffix array algorithms.

This introduces interface, implementation and unittests for:
 - suffix array construction using naive sort
 - suffix array construction using SA-IS
 - binary search in a suffix array

BUG=729154

Review-Url: https://codereview.chromium.org/2963463002
Cr-Commit-Position: refs/heads/master@{#485769}

chrome/installer/zucchini/BUILD.gn

@@ -13,6 +13,7 @@ static_library("zucchini_lib") {
     "disassembler.cc",
     "disassembler.h",
     "image_utils.h",
+    "suffix_array.h",
     "typed_value.h",
   ]
 
@@ -44,6 +45,7 @@ test("zucchini_unittests") {
   sources = [
     "buffer_view_unittest.cc",
     "crc32_unittest.cc",
+    "suffix_array_unittest.cc",
     "typed_value_unittest.cc",
   ]