Make LTE_FLOAT a strict weak order. (DO NOT MERGE)

Bug: 5327776

Currently LTE_FLOAT isn't even a valid partial order, let alone
a strict weak order as needed by binary search.  Consequently,
KeyedVectors with keys whose types have operator< using LTE_FLOAT
sometimes find the wrong values!

This problem affects several graphics caches including the
TextLayoutCache.

(This is still not a total order because NaNs are not comparable
but hopefully we don't ever search for NaNs this way!)

Change-Id: Ic447a34c7d87f681ee81538f22a0937a039072dd

Author: Jeff Brown

libs/hwui/utils/Compare.h

@@ -28,7 +28,7 @@
  */
 #define LTE_FLOAT(a) \
     if (a < rhs.a) return true; \
-    if (ALMOST_EQUAL(a, rhs.a))
+    if (a == rhs.a)
 
 /**
  * Compare integers.