commit 074fa51f85b15ad2e2d6c804a03825d48dbeb063
author Hans Wennborg <hans@chromium.org> Mon Sep 18 19:43:09 2017
committer Commit Bot <commit-bot@chromium.org> Mon Sep 18 19:43:09 2017
tree 47461a1305e58000b7311cfdb4189e88f99cfce4
parent 9a756143491707b8319890b00fde33394fdbe4ff

Reland "Clang: enable -instcombine-lower-dbg-declare=1"

Trying harder to exclude CrOS build configs that don't use
Chromium's Clang.

Note to CrOS folks: If this breaks build configs that are not
tested upstream, please ping me and/or llozano before reverting.

This is a reland of 32750c1251012624a87fb97098bd0f6a60ffa8ed
Original change's description:
> Clang: enable -instcombine-lower-dbg-declare=1
>
> This enables better optimized debug info for address-taken values
> at the cost of potentially inaccurate debug info in some situations.
>
> We believe turning this on is the right trade-off for developers
> debugging Chromium on all platforms, but especially on Windows where
> values that are available in MSVC's debug info would otherwise show
> as unavailable when using Clang.
>
> The goal (crbug.com/765793) is to make Clang's optimized
> debug info good enough in all cases that this compromise is not
> necessary.
>
> Note: This requires Clang r313108 or later.
>
> Bug: 761633, 753736, 765793
> Change-Id: Ia0ed38c499fac282a3c8ab27c5fd5571fdfab84d
> Reviewed-on: https://chromium-review.googlesource.com/669314
> Commit-Queue: Hans Wennborg <hans@chromium.org>
> Reviewed-by: Nico Weber <thakis@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#502428}

TBR=thakis

Bug: 761633, 753736, 765793
Change-Id: I2c3670873f1bd1d75cf1c41191b170983f41e0d0
Reviewed-on: https://chromium-review.googlesource.com/671523
Reviewed-by: Hans Wennborg <hans@chromium.org>
Commit-Queue: Hans Wennborg <hans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#502646}