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

breakpad/BUILD.gn

Index: breakpad/BUILD.gn
diff --git a/breakpad/BUILD.gn b/breakpad/BUILD.gn
index 233c5971598836d7834ca50e350680729aae781c..f3cf53a034cab938eea45f717cee3b1b96a64270 100644
--- a/breakpad/BUILD.gn
+++ b/breakpad/BUILD.gn
@@ -545,6 +545,13 @@ if (is_linux || is_android) {
       cflags = [ "-marm" ]
     }
 
+    if (current_cpu == "x86" && is_clang) {
+      # Clang's -mstackrealign doesn't work well with
+      # linux_syscall_support.h hand written asm syscalls.
+      # See https://crbug.com/556393
+      cflags -= [ "-mstackrealign" ]
+    }
+
     if (is_android) {
       sources += [ "src/common/android/breakpad_getcontext.S" ]
     }
@@ -650,6 +657,13 @@ if (is_linux || is_android) {
       libs = [ "log" ]
       include_dirs += [ "src/common/android/include" ]
     }
+
+    if (current_cpu == "x86" && is_clang) {
+      # Clang's -mstackrealign doesn't work well with
+      # linux_syscall_support.h hand written asm syscalls.
+      # See https://crbug.com/556393
+      cflags -= [ "-mstackrealign" ]
+    }
   }
 
   executable("linux_dumper_unittest_helper") {