Skip Clang's integrated-as for hand-coded assembly

Bug: http://b/28149048
Bug: http://b/29771478

Clang recently switched to using integrated assembler for Mips.
However, it fails to compile some of the hand-coded assembly files in
bionic.  Disable integrated-as for the time being.

Change-Id: I2eed4391f6827224da74383387bdd9105de5a857
diff --git a/libc/Android.bp b/libc/Android.bp
index ba62592..c7201cb 100644
--- a/libc/Android.bp
+++ b/libc/Android.bp
@@ -1082,6 +1082,8 @@
                     "arch-mips/string/mips_strlen.c",
                 ],
             },
+            // http://b/29771478 - disable integrated-as for Mips
+            asflags: ["-fno-integrated-as"],
         },
         mips64: {
             srcs: [
@@ -1458,6 +1460,8 @@
         },
         mips: {
             srcs: ["arch-mips/syscalls/**/*.S"],
+            // http://b/29771478 - disable integrated-as for Mips
+            asflags: ["-fno-integrated-as"],
         },
         mips64: {
             srcs: ["arch-mips64/syscalls/**/*.S"],