Update V8 to r6387 as required by WebKit r76408

Change-Id: Icfc5385b0996bd592f8b1ac8cbb44767ee09f1f6
diff --git a/src/arm/codegen-arm.cc b/src/arm/codegen-arm.cc
index d41c1d2..4a982f6 100644
--- a/src/arm/codegen-arm.cc
+++ b/src/arm/codegen-arm.cc
@@ -4667,8 +4667,7 @@
     __ mov(scratch2, Operand(0x7FF00000));
     __ mov(scratch1, Operand(0, RelocInfo::NONE));
     __ vmov(d1, scratch1, scratch2);  // Load infinity into d1.
-    __ vcmp(d0, d1);
-    __ vmrs(pc);
+    __ VFPCompareAndSetFlags(d0, d1);
     runtime.Branch(eq);  // d0 reached infinity.
     __ vdiv(d0, d2, d0);
     __ b(&allocate_return);