Roll HarfBuzz to 1.4.6

third_party/harfbuzz-ng/src/hb-common.cc

Index: third_party/harfbuzz-ng/src/hb-common.cc
diff --git a/third_party/harfbuzz-ng/src/hb-common.cc b/third_party/harfbuzz-ng/src/hb-common.cc
index 64e77d43472cee85f00bd35214de9252d86ab362..39006237a0c8fa164e792cdefcb3d0c4925a775f 100644
--- a/third_party/harfbuzz-ng/src/hb-common.cc
+++ b/third_party/harfbuzz-ng/src/hb-common.cc
@@ -186,8 +186,10 @@ lang_equal (hb_language_t  v1,
   const unsigned char *p1 = (const unsigned char *) v1;
   const unsigned char *p2 = (const unsigned char *) v2;
 
-  while (*p1 && *p1 == canon_map[*p2])
-    p1++, p2++;
+  while (*p1 && *p1 == canon_map[*p2]) {
+    p1++;
+    p2++;
+  }
 
   return *p1 == canon_map[*p2];
 }
@@ -667,7 +669,7 @@ parse_float (const char **pp, const char *end, float *pv)
   float v;
 
   errno = 0;
-  v = strtof (p, &pend);
+  v = strtod (p, &pend);
   if (errno || p == pend)
     return false;