Fix two APFloat bugs in converting hexadecimal constants.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79540 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/APFloat.cpp b/lib/Support/APFloat.cpp
index d15a21b..c13231d 100644
--- a/lib/Support/APFloat.cpp
+++ b/lib/Support/APFloat.cpp
@@ -2153,7 +2153,7 @@
     integerPart hex_value;
 
     if(*p == '.') {
-      assert(dot == 0);
+      assert(dot == s.end());
       dot = p++;
     }
 
@@ -2190,7 +2190,7 @@
     int expAdjustment;
 
     /* Implicit hexadecimal point?  */
-    if(!dot)
+    if (dot == s.end())
       dot = p;
 
     /* Calculate the exponent adjustment implicit in the number of