Enable symbols with ASan

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 7c4e60ede1586920c38b67cd49788b3c20f8dbde..bed40b5f675ee87167f1d30dc9330a36c16aa920 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -2458,13 +2458,12 @@
         ],
       }],
 
-      ['OS=="win" and clang==1', {
+      ['OS=="win" and clang==1 and asan==0', {
         # TODO(thakis): Remove this again once building with clang/win and
         # debug info doesn't make link.exe run for hours.
         'fastbuild': 1,
       }],
 
-
       ['host_clang==1', {
         'host_cc': '<(make_clang_dir)/bin/clang',
         'host_cxx': '<(make_clang_dir)/bin/clang++',
@@ -5926,6 +5925,8 @@
                     'AdditionalOptions': [
                       '-fsanitize=address',
                       '-fsanitize-blacklist=<(PRODUCT_DIR)/../../tools/memory/asan/blacklist_win.txt',
+		      # Omit variable info to speed up /Z7 links.
+		      '-gline-tables-only',
                     ],
                     'AdditionalIncludeDirectories': [
                       # MSVC needs to be able to find the sanitizer headers when