MIPS64: Fix compilation issues on MIPS64R6 with Clang.

This patch enables V8 build with Clang without errors for MIPS64
release R6.

TEST=
BUG=

Review-Url: https://codereview.chromium.org/2062713002
Cr-Commit-Position: refs/heads/master@{#36948}

src/base/atomicops_internals_mips64_gcc.h

@@ -91,7 +91,8 @@ inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32* ptr,
                                           Atomic32 increment) {
   Atomic32 temp, temp2;
 
-  __asm__ __volatile__(".set push\n"
+  __asm__ __volatile__(
+      ".set push\n"
       ".set noreorder\n"
       "1:\n"
       "ll %0, %2\n"        // temp = *ptr
@@ -100,8 +101,8 @@ inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32* ptr,
       "beqz %1, 1b\n"      // start again on atomic error
       "addu %1, %0, %3\n"  // temp2 = temp + increment
       ".set pop\n"
-                       : "=&r" (temp), "=&r" (temp2), "=m" (*ptr)
-                       : "Ir" (increment), "m" (*ptr)
+      : "=&r"(temp), "=&r"(temp2), "=ZC"(*ptr)
+      : "Ir"(increment), "m"(*ptr)
       : "memory");
   // temp2 now holds the final value.
   return temp2;
@@ -228,7 +229,8 @@ inline Atomic64 NoBarrier_AtomicIncrement(volatile Atomic64* ptr,
                                           Atomic64 increment) {
   Atomic64 temp, temp2;
 
-  __asm__ __volatile__(".set push\n"
+  __asm__ __volatile__(
+      ".set push\n"
       ".set noreorder\n"
       "1:\n"
       "lld %0, %2\n"        // temp = *ptr
@@ -237,8 +239,8 @@ inline Atomic64 NoBarrier_AtomicIncrement(volatile Atomic64* ptr,
       "beqz %1, 1b\n"       // start again on atomic error
       "daddu %1, %0, %3\n"  // temp2 = temp + increment
       ".set pop\n"
-                       : "=&r" (temp), "=&r" (temp2), "=m" (*ptr)
-                       : "Ir" (increment), "m" (*ptr)
+      : "=&r"(temp), "=&r"(temp2), "=ZC"(*ptr)
+      : "Ir"(increment), "m"(*ptr)
       : "memory");
   // temp2 now holds the final value.
   return temp2;