build: Reduce link concurrency for sanitizer coverage builds.

build/toolchain/concurrent_links.gni

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # This file should only be imported from files that define toolchains.
 # There's no way to enforce this exactly, but all toolchains are processed
 # in the context of the default_toolchain, so we can at least check for that.
 assert(current_toolchain == default_toolchain)
 
 import("//build/config/compiler/compiler.gni")
@@ skipping 15 matching lines @@
         "--mem_per_link_gb=10",
         "--reserve_mem_gb=10",
       ]
     } else {
       # Full LTO, needs lots of RAM
       _args = [
         "--mem_per_link_gb=26",
         "--reserve_mem_gb=20",
       ]
     }
+  } else if (use_sanitizer_coverage) {
+    # Sanitizer coverage instrumentation increases linker memory consumption
+    # significantly.
+    _args = [ "--mem_per_link_gb=12" ]
   } else if (is_win) {
     _args = [ "--mem_per_link_gb=5" ]
   } else if (is_mac) {
     _args = [ "--mem_per_link_gb=4" ]
   } else if (is_android && !is_component_build && symbol_level == 2) {
     _args = [ "--mem_per_link_gb=25" ]
   } else {
     _args = []
   }
 
   # TODO(crbug.com/617429) Pass more build configuration info to the script
   # so that we can compute better values.
   concurrent_links = exec_script("get_concurrent_links.py", _args, "value")
 }