Mark methods_stream as const.
Mark methods_stream as const.

Function pointer tables require relocations, so this goes into
.data.rel.ro, not .rodata, but this will at least mark the pages
read-only after relocations are resolved.

Bug: None
Change-Id: I8625e7466b2dcadafc4e4e5f9c6eccbd87af7109
Reviewed-on: https://webrtc-review.googlesource.com/4580
Reviewed-by: Taylor Brandstetter <f49cf6381e322b147053b74e4500af8533ac1e4c@webrtc.org>
Commit-Queue: Taylor Brandstetter <f49cf6381e322b147053b74e4500af8533ac1e4c@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#20029}
TimothyGu/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc