Add Arm64 support to dtoa/utils.h

BUG=354405

Review URL: https://codereview.chromium.org/206743003

git-svn-id: svn://svn.chromium.org/blink/trunk@169689 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/wtf/dtoa/utils.h

@@ -45,7 +45,7 @@
 // disabled.)
 // On Linux,x86 89255e-22 != Div_double(89255.0/1e22)
 #if defined(_M_X64) || defined(__x86_64__) || \
-defined(__ARMEL__) || \
+defined(__ARMEL__) || defined(__aarch64__) || \
 defined(__MIPSEL__)
 #define DOUBLE_CONVERSION_CORRECT_DOUBLE_OPERATIONS 1
 #elif defined(_M_IX86) || defined(__i386__)