[Linux] Turn off -mstackrealign for breakpad in ia32.

breakpad/breakpad.gyp

Index: breakpad/breakpad.gyp
diff --git a/breakpad/breakpad.gyp b/breakpad/breakpad.gyp
index 52bf0db1e877d9f35c64a98e3568624ae25853d7..00d2bc547c2ad5a6e35b86d23bb5245f7617f20b 100644
--- a/breakpad/breakpad.gyp
+++ b/breakpad/breakpad.gyp
@@ -595,6 +595,14 @@
                 ],
               },
             }],
+            ['clang==1 and target_arch=="ia32"', {
+              'cflags!': [
+                # Clang's -mstackrealign doesn't work well with
+                # linux_syscall_support.h hand written asm syscalls.
+                # See https://crbug.com/556393
+                '-mstackrealign',
+              ],
+            }],
           ],
 
           'include_dirs': [
@@ -704,6 +712,14 @@
               },
               'includes': [ '../build/android/test_runner.gypi' ],
             }],
+            ['clang==1 and target_arch=="ia32"', {
+              'cflags!': [
+                # Clang's -mstackrealign doesn't work well with
+                # linux_syscall_support.h hand written asm syscalls.
+                # See https://crbug.com/556393
+                '-mstackrealign',
+              ],
+            }],
           ],
         },
         {