Bug 1484073 - Emit less detailed debug info for Linux coverage builds. r=glandium

DONTBUILD as the coverage builds are only run on mozilla-central

--HG--
extra : rebase_source : 6ffbd33524b8d4100d33871aeb14c1011a61bee5
extra : histedit_source : d2b54dde2836f5e13017b6bf587f82629de77b80

browser/config/mozconfigs/linux64/code-coverage-debug

@@ -1,3 +1,3 @@
 . "$topsrcdir/browser/config/mozconfigs/linux64/code-coverage"
 
-ac_add_options --enable-debug
+ac_add_options --enable-debug=-g1

browser/config/mozconfigs/linux64/code-coverage-opt

@@ -1 +1,3 @@
 . "$topsrcdir/browser/config/mozconfigs/linux64/code-coverage"
+
+ac_add_options --enable-debug-symbols=-g1